---
_id: '8269'
abstract:
- lang: eng
  text: Currently existing graph grammar-based specification languages have serious
    problems with supporting any kind of “specification-in-the-large” activities.
    More precisely, they have deficiencies with respect to modeling hierarchical data
    structures or specifying meta activities like manipulation of graph schemata.
    Furthermore, already proposed graph grammar module concepts are still too abstract
    to be useful in practice. Our contribution addresses these problems by introducing
    a new hierarchical graph data model with an infinite number of schema, meta-schema,
    etc. layers. It forms the base for a forthcoming concrete modular graph grammar
    specification language where in addition information hiding aspects like explicit
    export and import interfaces are expressible.
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Andy
  full_name: Schürr, Andy
  last_name: Schürr
citation:
  ama: 'Engels G, Schürr A. Encapsulated Hierarchical Graphs, Graph Types, and Meta
    Types. In: <i>Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop on Graph
    Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy)</i>. Electronic Notes
    in Theoretical Computer Science. Amsterdam, The Netherlands: Elsevier; 1995:101-109.
    doi:<a href="http://dx.doi.org/10.1016/S1571-0661(05)80186-0">http://dx.doi.org/10.1016/S1571-0661(05)80186-0</a>'
  apa: 'Engels, G., &#38; Schürr, A. (1995). Encapsulated Hierarchical Graphs, Graph
    Types, and Meta Types. In <i>Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop
    on Graph Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy)</i> (pp.
    101–109). Amsterdam, The Netherlands: Elsevier. <a href="http://dx.doi.org/10.1016/S1571-0661(05)80186-0">http://dx.doi.org/10.1016/S1571-0661(05)80186-0</a>'
  bibtex: '@inproceedings{Engels_Schürr_1995, place={Amsterdam, The Netherlands},
    series={Electronic Notes in Theoretical Computer Science}, title={Encapsulated
    Hierarchical Graphs, Graph Types, and Meta Types}, DOI={<a href="http://dx.doi.org/10.1016/S1571-0661(05)80186-0">http://dx.doi.org/10.1016/S1571-0661(05)80186-0</a>},
    booktitle={Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop on Graph Rewriting
    and Computation (SEGRAGRA 1995), Volterra (Italy)}, publisher={Elsevier}, author={Engels,
    Gregor and Schürr, Andy}, year={1995}, pages={101–109}, collection={Electronic
    Notes in Theoretical Computer Science} }'
  chicago: 'Engels, Gregor, and Andy Schürr. “Encapsulated Hierarchical Graphs, Graph
    Types, and Meta Types.” In <i>Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop
    on Graph Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy)</i>, 101–9.
    Electronic Notes in Theoretical Computer Science. Amsterdam, The Netherlands:
    Elsevier, 1995. <a href="http://dx.doi.org/10.1016/S1571-0661(05)80186-0">http://dx.doi.org/10.1016/S1571-0661(05)80186-0</a>.'
  ieee: G. Engels and A. Schürr, “Encapsulated Hierarchical Graphs, Graph Types, and
    Meta Types,” in <i>Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop on Graph
    Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy)</i>, 1995, pp. 101–109.
  mla: Engels, Gregor, and Andy Schürr. “Encapsulated Hierarchical Graphs, Graph Types,
    and Meta Types.” <i>Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop on
    Graph Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy)</i>, Elsevier,
    1995, pp. 101–09, doi:<a href="http://dx.doi.org/10.1016/S1571-0661(05)80186-0">http://dx.doi.org/10.1016/S1571-0661(05)80186-0</a>.
  short: 'G. Engels, A. Schürr, in: Proceedings of the Joint COMPUGRAPH/SEMAGRAPH
    Workshop on Graph Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy),
    Elsevier, Amsterdam, The Netherlands, 1995, pp. 101–109.'
date_created: 2019-03-04T11:52:20Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
doi: http://dx.doi.org/10.1016/S1571-0661(05)80186-0
language:
- iso: eng
page: 101-109
place: Amsterdam, The Netherlands
publication: Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop on Graph Rewriting
  and Computation (SEGRAGRA 1995), Volterra (Italy)
publisher: Elsevier
series_title: Electronic Notes in Theoretical Computer Science
status: public
title: Encapsulated Hierarchical Graphs, Graph Types, and Meta Types
type: conference
user_id: '52534'
year: '1995'
...
---
_id: '7797'
abstract:
- lang: eng
  text: During the last decades there has been progress within the object-oriented
    community in agreeing on what object- orientedness means. The role of object identity,
    specialization, inheritance, and dynamic binding have been examined. However,
    a careful look at articles written by people with a theory, programming language,
    database, and software engineering background shows that the semantical understanding
    of the same features still differs considerably. A well-known example is the feature
    of inheritance, which has quite a different meaning for persons from the database
    comunity with a semantic data model background and persons form the programming
    language community with a compiling technique background This observation also
    applies to the literaute on object-oriented software development methods. Here,
    object -oriented analysis and design methods are often heavily influenced by semantic
    data modelling consepts- An implemantion of an object-orinted design by an objeckt-oriented
    progamming language usually causes more difficulties than expected although the
    "same" object-oriente paradigm is used...
citation:
  ama: Ehrich H-D, Engels G, Paredaens J, Wegner J, eds. <i>Fundamentals of Object-Oriented
    Languages, Systems, and Methods</i>. Vol 95. Schloss Dagstuhl, Leibniz Center
    for Informatics; 1994.
  apa: Ehrich, H.-D., Engels, G., Paredaens, J., &#38; Wegner, J. (Eds.). (1994).
    <i>Fundamentals of Object-Oriented Languages, Systems, and Methods</i> (Vol. 95).
    Schloss Dagstuhl, Leibniz Center for Informatics.
  bibtex: '@book{Ehrich_Engels_Paredaens_Wegner_1994, series={Dagstuhl-Seminar-Report},
    title={Fundamentals of Object-Oriented Languages, Systems, and Methods}, volume={95},
    publisher={Schloss Dagstuhl, Leibniz Center for Informatics}, year={1994}, collection={Dagstuhl-Seminar-Report}
    }'
  chicago: Ehrich, Hans-Dietrich, Gregor Engels, J. Paredaens, and Jan Wegner, eds.
    <i>Fundamentals of Object-Oriented Languages, Systems, and Methods</i>. Vol. 95.
    Dagstuhl-Seminar-Report. Schloss Dagstuhl, Leibniz Center for Informatics, 1994.
  ieee: H.-D. Ehrich, G. Engels, J. Paredaens, and J. Wegner, Eds., <i>Fundamentals
    of Object-Oriented Languages, Systems, and Methods</i>, vol. 95. Schloss Dagstuhl,
    Leibniz Center for Informatics, 1994.
  mla: Ehrich, Hans-Dietrich, et al., editors. <i>Fundamentals of Object-Oriented
    Languages, Systems, and Methods</i>. Vol. 95, Schloss Dagstuhl, Leibniz Center
    for Informatics, 1994.
  short: H.-D. Ehrich, G. Engels, J. Paredaens, J. Wegner, eds., Fundamentals of Object-Oriented
    Languages, Systems, and Methods, Schloss Dagstuhl, Leibniz Center for Informatics,
    1994.
date_created: 2019-02-19T19:19:14Z
date_updated: 2022-01-06T07:03:46Z
department:
- _id: '66'
editor:
- first_name: Hans-Dietrich
  full_name: Ehrich, Hans-Dietrich
  last_name: Ehrich
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: J.
  full_name: Paredaens, J.
  last_name: Paredaens
- first_name: Jan
  full_name: Wegner, Jan
  last_name: Wegner
intvolume: '        95'
language:
- iso: eng
publisher: Schloss Dagstuhl, Leibniz Center for Informatics
series_title: Dagstuhl-Seminar-Report
status: public
title: Fundamentals of Object-Oriented Languages, Systems, and Methods
type: conference_editor
user_id: '52534'
volume: 95
year: '1994'
...
---
_id: '7798'
citation:
  ama: 'Cuny J, Ehrig H, Engels G, Rozenberg G, eds. <i>Graph Gramars and Their Application
    to Computer Science, 5th International Workshop (1994), Selected Papers</i>. Vol
    1073. Berlin/Heidelberg: Springer; 1994. doi:<a href="http://dx.doi.org/10.1007/3-540-61228-9">http://dx.doi.org/10.1007/3-540-61228-9</a>'
  apa: 'Cuny, J., Ehrig, H., Engels, G., &#38; Rozenberg, G. (Eds.). (1994). <i>Graph
    Gramars and Their Application to Computer Science, 5th International Workshop
    (1994), Selected Papers</i> (Vol. 1073). Berlin/Heidelberg: Springer. <a href="http://dx.doi.org/10.1007/3-540-61228-9">http://dx.doi.org/10.1007/3-540-61228-9</a>'
  bibtex: '@book{Cuny_Ehrig_Engels_Rozenberg_1994, place={Berlin/Heidelberg}, series={LNCS},
    title={Graph Gramars and Their Application to Computer Science, 5th International
    Workshop (1994), Selected Papers}, volume={1073}, DOI={<a href="http://dx.doi.org/10.1007/3-540-61228-9">http://dx.doi.org/10.1007/3-540-61228-9</a>},
    publisher={Springer}, year={1994}, collection={LNCS} }'
  chicago: 'Cuny, Janice, Hartmut Ehrig, Gregor Engels, and Grzegorz Rozenberg, eds.
    <i>Graph Gramars and Their Application to Computer Science, 5th International
    Workshop (1994), Selected Papers</i>. Vol. 1073. LNCS. Berlin/Heidelberg: Springer,
    1994. <a href="http://dx.doi.org/10.1007/3-540-61228-9">http://dx.doi.org/10.1007/3-540-61228-9</a>.'
  ieee: 'J. Cuny, H. Ehrig, G. Engels, and G. Rozenberg, Eds., <i>Graph Gramars and
    Their Application to Computer Science, 5th International Workshop (1994), Selected
    Papers</i>, vol. 1073. Berlin/Heidelberg: Springer, 1994.'
  mla: Cuny, Janice, et al., editors. <i>Graph Gramars and Their Application to Computer
    Science, 5th International Workshop (1994), Selected Papers</i>. Vol. 1073, Springer,
    1994, doi:<a href="http://dx.doi.org/10.1007/3-540-61228-9">http://dx.doi.org/10.1007/3-540-61228-9</a>.
  short: J. Cuny, H. Ehrig, G. Engels, G. Rozenberg, eds., Graph Gramars and Their
    Application to Computer Science, 5th International Workshop (1994), Selected Papers,
    Springer, Berlin/Heidelberg, 1994.
date_created: 2019-02-19T19:19:58Z
date_updated: 2022-01-06T07:03:46Z
department:
- _id: '66'
doi: http://dx.doi.org/10.1007/3-540-61228-9
editor:
- first_name: Janice
  full_name: Cuny, Janice
  last_name: Cuny
- first_name: Hartmut
  full_name: Ehrig, Hartmut
  last_name: Ehrig
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Grzegorz
  full_name: Rozenberg, Grzegorz
  last_name: Rozenberg
intvolume: '      1073'
language:
- iso: eng
place: Berlin/Heidelberg
publisher: Springer
series_title: LNCS
status: public
title: Graph Gramars and Their Application to Computer Science, 5th International
  Workshop (1994), Selected Papers
type: conference_editor
user_id: '52534'
volume: 1073
year: '1994'
...
---
_id: '7828'
abstract:
- lang: eng
  text: Object-oriented specification languages provide means to specify the static
    structure, as well as the allowed dynamic behaviour of objects. Here, the dynamic
    behaviour is usually described by giving the methods and a state transition diagram
    which defines the allowed sequences of methods on objects of a certain class.
    Specialized classes are defined using the inheritance relationship. In order to
    enable reusability while guaranteeing type substitutability, subclass specifications
    have to be compatible with respect to static and dynamic aspects with their corresponding
    superclass specifications. Classes have to provide a large shopping list of operations
    to satisfy the needs of all possible users. The interests of specific users are
    often restricted to a subset of operations and thus to a restricted behaviour.
    This paper describes a formalization of class descriptions given by attributes,
    operations, as well as state transition diagrams. It defines compatibility between
    sub- and superclasses and introduces the notion of views in the sense of hiding
    parts of a class description. It turns out that a view has the same properties
    as a (virtual) superclass.
author:
- first_name: Jürgen
  full_name: Ebert, Jürgen
  last_name: Ebert
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: 'Ebert J, Engels G. Structural and Behavioural Views on OMT-Classes. In: <i>Proceedings
    of the International Symposium on Object-Oriented Methodologies and Systems (ISOOMS
    1994), Palermo (Italy)</i>. Vol 858. Berlin/Heidelberg: Springer; 1994:142-157.'
  apa: 'Ebert, J., &#38; Engels, G. (1994). Structural and Behavioural Views on OMT-Classes.
    In <i>Proceedings of the International Symposium on Object-Oriented Methodologies
    and Systems (ISOOMS 1994), Palermo (Italy)</i> (Vol. 858, pp. 142–157). Berlin/Heidelberg:
    Springer.'
  bibtex: '@inproceedings{Ebert_Engels_1994, place={Berlin/Heidelberg}, title={Structural
    and Behavioural Views on OMT-Classes}, volume={858}, booktitle={Proceedings of
    the International Symposium on Object-Oriented Methodologies and Systems (ISOOMS
    1994), Palermo (Italy)}, publisher={Springer}, author={Ebert, Jürgen and Engels,
    Gregor}, year={1994}, pages={142–157} }'
  chicago: 'Ebert, Jürgen, and Gregor Engels. “Structural and Behavioural Views on
    OMT-Classes.” In <i>Proceedings of the International Symposium on Object-Oriented
    Methodologies and Systems (ISOOMS 1994), Palermo (Italy)</i>, 858:142–57. Berlin/Heidelberg:
    Springer, 1994.'
  ieee: J. Ebert and G. Engels, “Structural and Behavioural Views on OMT-Classes,”
    in <i>Proceedings of the International Symposium on Object-Oriented Methodologies
    and Systems (ISOOMS 1994), Palermo (Italy)</i>, 1994, vol. 858, pp. 142–157.
  mla: Ebert, Jürgen, and Gregor Engels. “Structural and Behavioural Views on OMT-Classes.”
    <i>Proceedings of the International Symposium on Object-Oriented Methodologies
    and Systems (ISOOMS 1994), Palermo (Italy)</i>, vol. 858, Springer, 1994, pp.
    142–57.
  short: 'J. Ebert, G. Engels, in: Proceedings of the International Symposium on Object-Oriented
    Methodologies and Systems (ISOOMS 1994), Palermo (Italy), Springer, Berlin/Heidelberg,
    1994, pp. 142–157.'
date_created: 2019-02-20T13:54:14Z
date_updated: 2022-01-06T07:03:46Z
department:
- _id: '66'
intvolume: '       858'
language:
- iso: eng
page: 142-157
place: Berlin/Heidelberg
publication: Proceedings of the International Symposium on Object-Oriented Methodologies
  and Systems (ISOOMS 1994), Palermo (Italy)
publisher: Springer
status: public
title: Structural and Behavioural Views on OMT-Classes
type: conference
user_id: '52534'
volume: 858
year: '1994'
...
---
_id: '7829'
abstract:
- lang: eng
  text: Object-oriented system development is wideley recognized as improving productivity
    and reducing system maintenance costs. However, existing approaches have not sufficiently
    addressed the following three questions which are equally important to users and
    researchers. Firstly, what are the benefits of object-oriented system development
    compared to traditional approaches? Secondly, what are the essential features
    of an objectoriented life cycle model to fulfill the benefits of object-oriented
    development? And thirdly, what are the pitfalls of object-oriented development
    and how to cope with them? The paper investigates answers to all three questions
    in concert.
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Gerti
  full_name: Kappel, Gerti
  last_name: Kappel
citation:
  ama: 'Engels G, Kappel G. Object-Oriented System Development: Will the New Approach
    Solve Old Problems? In: <i>Proceedings of the IFIP 13th World Computer Congress
    on Information Processing, Hamburg (Germany)</i>. Vol 3. Elsevier; 1994:434-441.'
  apa: 'Engels, G., &#38; Kappel, G. (1994). Object-Oriented System Development: Will
    the New Approach Solve Old Problems? In <i>Proceedings of the IFIP 13th World
    Computer Congress on Information Processing, Hamburg (Germany)</i> (Vol. 3, pp.
    434–441). Elsevier.'
  bibtex: '@inproceedings{Engels_Kappel_1994, title={Object-Oriented System Development:
    Will the New Approach Solve Old Problems?}, volume={3}, booktitle={Proceedings
    of the IFIP 13th World Computer Congress on Information Processing, Hamburg (Germany)},
    publisher={Elsevier}, author={Engels, Gregor and Kappel, Gerti}, year={1994},
    pages={434–441} }'
  chicago: 'Engels, Gregor, and Gerti Kappel. “Object-Oriented System Development:
    Will the New Approach Solve Old Problems?” In <i>Proceedings of the IFIP 13th
    World Computer Congress on Information Processing, Hamburg (Germany)</i>, 3:434–41.
    Elsevier, 1994.'
  ieee: 'G. Engels and G. Kappel, “Object-Oriented System Development: Will the New
    Approach Solve Old Problems?,” in <i>Proceedings of the IFIP 13th World Computer
    Congress on Information Processing, Hamburg (Germany)</i>, 1994, vol. 3, pp. 434–441.'
  mla: 'Engels, Gregor, and Gerti Kappel. “Object-Oriented System Development: Will
    the New Approach Solve Old Problems?” <i>Proceedings of the IFIP 13th World Computer
    Congress on Information Processing, Hamburg (Germany)</i>, vol. 3, Elsevier, 1994,
    pp. 434–41.'
  short: 'G. Engels, G. Kappel, in: Proceedings of the IFIP 13th World Computer Congress
    on Information Processing, Hamburg (Germany), Elsevier, 1994, pp. 434–441.'
date_created: 2019-02-20T13:58:33Z
date_updated: 2022-01-06T07:03:46Z
department:
- _id: '66'
intvolume: '         3'
language:
- iso: eng
page: 434-441
publication: Proceedings of the IFIP 13th World Computer Congress on Information Processing,
  Hamburg (Germany)
publisher: Elsevier
status: public
title: 'Object-Oriented System Development: Will the New Approach Solve Old Problems?'
type: conference
user_id: '52534'
volume: 3
year: '1994'
...
---
_id: '7830'
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Hartmut
  full_name: Ehrig, Hartmut
  last_name: Ehrig
citation:
  ama: 'Engels G, Ehrig H. Towards a Module Concept for Graph Transformation Systems:
    The Software Engineering Perspective. In: <i>Proceedings Colloquium on Graph Transformation
    and Its Application in Computer Science</i>. Vol B-19. Technical Report . Universitat
    de les Illes Balears, Departament de Ci; 1994.'
  apa: 'Engels, G., &#38; Ehrig, H. (1994). Towards a Module Concept for Graph Transformation
    Systems: The Software Engineering Perspective. In <i>Proceedings Colloquium on
    Graph Transformation and its Application in Computer Science</i> (Vol. B-19).
    Universitat de les Illes Balears, Departament de Ci.'
  bibtex: '@inproceedings{Engels_Ehrig_1994, series={Technical Report }, title={Towards
    a Module Concept for Graph Transformation Systems: The Software Engineering Perspective},
    volume={B-19}, booktitle={Proceedings Colloquium on Graph Transformation and its
    Application in Computer Science}, publisher={Universitat de les Illes Balears,
    Departament de Ci}, author={Engels, Gregor and Ehrig, Hartmut}, year={1994}, collection={Technical
    Report } }'
  chicago: 'Engels, Gregor, and Hartmut Ehrig. “Towards a Module Concept for Graph
    Transformation Systems: The Software Engineering Perspective.” In <i>Proceedings
    Colloquium on Graph Transformation and Its Application in Computer Science</i>,
    Vol. B-19. Technical Report . Universitat de les Illes Balears, Departament de
    Ci, 1994.'
  ieee: 'G. Engels and H. Ehrig, “Towards a Module Concept for Graph Transformation
    Systems: The Software Engineering Perspective,” in <i>Proceedings Colloquium on
    Graph Transformation and its Application in Computer Science</i>, 1994, vol. B-19.'
  mla: 'Engels, Gregor, and Hartmut Ehrig. “Towards a Module Concept for Graph Transformation
    Systems: The Software Engineering Perspective.” <i>Proceedings Colloquium on Graph
    Transformation and Its Application in Computer Science</i>, vol. B-19, Universitat
    de les Illes Balears, Departament de Ci, 1994.'
  short: 'G. Engels, H. Ehrig, in: Proceedings Colloquium on Graph Transformation
    and Its Application in Computer Science, Universitat de les Illes Balears, Departament
    de Ci, 1994.'
date_created: 2019-02-20T13:59:14Z
date_updated: 2022-01-06T07:03:46Z
department:
- _id: '66'
language:
- iso: eng
publication: Proceedings Colloquium on Graph Transformation and its Application in
  Computer Science
publisher: Universitat de les Illes Balears, Departament de Ci
series_title: 'Technical Report '
status: public
title: 'Towards a Module Concept for Graph Transformation Systems: The Software Engineering
  Perspective'
type: conference
user_id: '52534'
volume: B-19
year: '1994'
...
---
_id: '8193'
author:
- first_name: Jürgen
  full_name: Ebert, Jürgen
  last_name: Ebert
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: Ebert J, Engels G. <i>Observable or Invocable Behaviour - You Have to Choose</i>.
    Vakgroep Informatica, Rijksuniversiteit Leiden; 1994.
  apa: Ebert, J., &#38; Engels, G. (1994). <i>Observable or Invocable Behaviour -
    You Have to Choose</i>. Vakgroep Informatica, Rijksuniversiteit Leiden.
  bibtex: '@book{Ebert_Engels_1994, title={Observable or Invocable Behaviour - You
    Have to Choose}, publisher={Vakgroep Informatica, Rijksuniversiteit Leiden}, author={Ebert,
    Jürgen and Engels, Gregor}, year={1994} }'
  chicago: Ebert, Jürgen, and Gregor Engels. <i>Observable or Invocable Behaviour
    - You Have to Choose</i>. Vakgroep Informatica, Rijksuniversiteit Leiden, 1994.
  ieee: J. Ebert and G. Engels, <i>Observable or Invocable Behaviour - You Have to
    Choose</i>. Vakgroep Informatica, Rijksuniversiteit Leiden, 1994.
  mla: Ebert, Jürgen, and Gregor Engels. <i>Observable or Invocable Behaviour - You
    Have to Choose</i>. Vakgroep Informatica, Rijksuniversiteit Leiden, 1994.
  short: J. Ebert, G. Engels, Observable or Invocable Behaviour - You Have to Choose,
    Vakgroep Informatica, Rijksuniversiteit Leiden, 1994.
date_created: 2019-03-03T16:12:48Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
language:
- iso: eng
publisher: Vakgroep Informatica, Rijksuniversiteit Leiden
report_number: 94-38
status: public
title: Observable or Invocable Behaviour - You Have to Choose
type: report
user_id: '52534'
year: '1994'
...
---
_id: '8263'
abstract:
- lang: eng
  text: We present the hybrid query language HQL/EER for an Extended Entity-Relationship
    model. As its main characteristic, this language allows a user to freely mix graphical
    and textual formulation of a query. We show how syntax and semantics of this hybrid
    language are formally defined by means of a slightly extended version of PROGRES,
    a specification formalism based on programmed and attributed graph rewriting systems.
author:
- first_name: Marc
  full_name: Andries, Marc
  last_name: Andries
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: 'Andries M, Engels G. Syntax and Semantics of Hybrid Database Languages. In:
    <i>Proceedings of the International Workshop on Graph Transformations in Computer
    Science (1993), Dagstuhl (Germany)</i>. Vol 776. LNCS. Berlin/Heidelberg: Springer;
    1994:19-36. doi:<a href="http://dx.doi.org/10.1007/3-540-57787-4_2">http://dx.doi.org/10.1007/3-540-57787-4_2</a>'
  apa: 'Andries, M., &#38; Engels, G. (1994). Syntax and Semantics of Hybrid Database
    Languages. In <i>Proceedings of the International Workshop on Graph Transformations
    in Computer Science (1993), Dagstuhl (Germany)</i> (Vol. 776, pp. 19–36). Berlin/Heidelberg:
    Springer. <a href="http://dx.doi.org/10.1007/3-540-57787-4_2">http://dx.doi.org/10.1007/3-540-57787-4_2</a>'
  bibtex: '@inproceedings{Andries_Engels_1994, place={Berlin/Heidelberg}, series={LNCS},
    title={Syntax and Semantics of Hybrid Database Languages}, volume={776}, DOI={<a
    href="http://dx.doi.org/10.1007/3-540-57787-4_2">http://dx.doi.org/10.1007/3-540-57787-4_2</a>},
    booktitle={Proceedings of the International Workshop on Graph Transformations
    in Computer Science (1993), Dagstuhl (Germany)}, publisher={Springer}, author={Andries,
    Marc and Engels, Gregor}, year={1994}, pages={19–36}, collection={LNCS} }'
  chicago: 'Andries, Marc, and Gregor Engels. “Syntax and Semantics of Hybrid Database
    Languages.” In <i>Proceedings of the International Workshop on Graph Transformations
    in Computer Science (1993), Dagstuhl (Germany)</i>, 776:19–36. LNCS. Berlin/Heidelberg:
    Springer, 1994. <a href="http://dx.doi.org/10.1007/3-540-57787-4_2">http://dx.doi.org/10.1007/3-540-57787-4_2</a>.'
  ieee: M. Andries and G. Engels, “Syntax and Semantics of Hybrid Database Languages,”
    in <i>Proceedings of the International Workshop on Graph Transformations in Computer
    Science (1993), Dagstuhl (Germany)</i>, 1994, vol. 776, pp. 19–36.
  mla: Andries, Marc, and Gregor Engels. “Syntax and Semantics of Hybrid Database
    Languages.” <i>Proceedings of the International Workshop on Graph Transformations
    in Computer Science (1993), Dagstuhl (Germany)</i>, vol. 776, Springer, 1994,
    pp. 19–36, doi:<a href="http://dx.doi.org/10.1007/3-540-57787-4_2">http://dx.doi.org/10.1007/3-540-57787-4_2</a>.
  short: 'M. Andries, G. Engels, in: Proceedings of the International Workshop on
    Graph Transformations in Computer Science (1993), Dagstuhl (Germany), Springer,
    Berlin/Heidelberg, 1994, pp. 19–36.'
date_created: 2019-03-04T11:52:13Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
doi: http://dx.doi.org/10.1007/3-540-57787-4_2
intvolume: '       776'
language:
- iso: eng
page: 19-36
place: Berlin/Heidelberg
publication: Proceedings of the International Workshop on Graph Transformations in
  Computer Science (1993), Dagstuhl (Germany)
publisher: Springer
series_title: LNCS
status: public
title: Syntax and Semantics of Hybrid Database Languages
type: conference
user_id: '52534'
volume: 776
year: '1994'
...
---
_id: '8264'
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Luuk
  full_name: Groenewegen, Luuk
  last_name: Groenewegen
citation:
  ama: 'Engels G, Groenewegen L. Specification of coordinated behaviour by SOCCA.
    In: <i>Proceedings of the Third European Workshop on Software Process Technology
    (EWSPT 1994), Villard de Lans (France)</i>. LNCS. Berlin/Heidelberg: Springer;
    1994:128-151. doi:<a href="http://dx.doi.org/10.1007/3-540-57739-4_19">http://dx.doi.org/10.1007/3-540-57739-4_19</a>'
  apa: 'Engels, G., &#38; Groenewegen, L. (1994). Specification of coordinated behaviour
    by SOCCA. In <i>Proceedings of the Third European Workshop on Software Process
    Technology (EWSPT 1994), Villard de Lans (France)</i> (pp. 128–151). Berlin/Heidelberg:
    Springer. <a href="http://dx.doi.org/10.1007/3-540-57739-4_19">http://dx.doi.org/10.1007/3-540-57739-4_19</a>'
  bibtex: '@inproceedings{Engels_Groenewegen_1994, place={Berlin/Heidelberg}, series={LNCS},
    title={Specification of coordinated behaviour by SOCCA}, DOI={<a href="http://dx.doi.org/10.1007/3-540-57739-4_19">http://dx.doi.org/10.1007/3-540-57739-4_19</a>},
    booktitle={Proceedings of the Third European Workshop on Software Process Technology
    (EWSPT 1994), Villard de Lans (France)}, publisher={Springer}, author={Engels,
    Gregor and Groenewegen, Luuk}, year={1994}, pages={128–151}, collection={LNCS}
    }'
  chicago: 'Engels, Gregor, and Luuk Groenewegen. “Specification of Coordinated Behaviour
    by SOCCA.” In <i>Proceedings of the Third European Workshop on Software Process
    Technology (EWSPT 1994), Villard de Lans (France)</i>, 128–51. LNCS. Berlin/Heidelberg:
    Springer, 1994. <a href="http://dx.doi.org/10.1007/3-540-57739-4_19">http://dx.doi.org/10.1007/3-540-57739-4_19</a>.'
  ieee: G. Engels and L. Groenewegen, “Specification of coordinated behaviour by SOCCA,”
    in <i>Proceedings of the Third European Workshop on Software Process Technology
    (EWSPT 1994), Villard de Lans (France)</i>, 1994, pp. 128–151.
  mla: Engels, Gregor, and Luuk Groenewegen. “Specification of Coordinated Behaviour
    by SOCCA.” <i>Proceedings of the Third European Workshop on Software Process Technology
    (EWSPT 1994), Villard de Lans (France)</i>, Springer, 1994, pp. 128–51, doi:<a
    href="http://dx.doi.org/10.1007/3-540-57739-4_19">http://dx.doi.org/10.1007/3-540-57739-4_19</a>.
  short: 'G. Engels, L. Groenewegen, in: Proceedings of the Third European Workshop
    on Software Process Technology (EWSPT 1994), Villard de Lans (France), Springer,
    Berlin/Heidelberg, 1994, pp. 128–151.'
date_created: 2019-03-04T11:52:14Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
doi: http://dx.doi.org/10.1007/3-540-57739-4_19
language:
- iso: eng
page: 128-151
place: Berlin/Heidelberg
publication: Proceedings of the Third European Workshop on Software Process Technology
  (EWSPT 1994), Villard de Lans (France)
publisher: Springer
series_title: LNCS
status: public
title: Specification of coordinated behaviour by SOCCA
type: conference
user_id: '52534'
year: '1994'
...
---
_id: '8265'
abstract:
- lang: eng
  text: The paper presents an approach to specify in an integrated way by visual,
    diagrammatic languages the structural and behavioural aspects of database applications.
    Hereby, well-known extended Entity-Relationship diagrams are employed to specify
    the structural aspects. The behavioural aspects of a database application are
    specified by using ViAL (Visual Action Language). ViAL specifications are a special
    kind of data (or better object) flow diagrams, where so-called elementary actions
    are used as basic building blocks. These elementary actions are automatically
    derived from a given EER diagram. They guarantee that after finishing their execution
    all inherent integrity constraints are fulfilled. The paper explains the features
    of the language ViAL and gives some illustrating examples.
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Perdita
  full_name: Löhr, Perdita
  last_name: Löhr
citation:
  ama: 'Engels G, Löhr P. Visual Specification of Complex Database Actions. In: <i>Proceedings
    of the 2nd International East/West Database Workshop, Klagenfurt (Germany)</i>.
    Berlin/Heidelberg: Springer; 1994:303-314.'
  apa: 'Engels, G., &#38; Löhr, P. (1994). Visual Specification of Complex Database
    Actions. In <i>Proceedings of the 2nd International East/West Database Workshop,
    Klagenfurt (Germany)</i> (pp. 303–314). Berlin/Heidelberg: Springer.'
  bibtex: '@inproceedings{Engels_Löhr_1994, place={Berlin/Heidelberg}, title={Visual
    Specification of Complex Database Actions}, booktitle={Proceedings of the 2nd
    International East/West Database Workshop, Klagenfurt (Germany)}, publisher={Springer},
    author={Engels, Gregor and Löhr, Perdita}, year={1994}, pages={303–314} }'
  chicago: 'Engels, Gregor, and Perdita Löhr. “Visual Specification of Complex Database
    Actions.” In <i>Proceedings of the 2nd International East/West Database Workshop,
    Klagenfurt (Germany)</i>, 303–14. Berlin/Heidelberg: Springer, 1994.'
  ieee: G. Engels and P. Löhr, “Visual Specification of Complex Database Actions,”
    in <i>Proceedings of the 2nd International East/West Database Workshop, Klagenfurt
    (Germany)</i>, 1994, pp. 303–314.
  mla: Engels, Gregor, and Perdita Löhr. “Visual Specification of Complex Database
    Actions.” <i>Proceedings of the 2nd International East/West Database Workshop,
    Klagenfurt (Germany)</i>, Springer, 1994, pp. 303–14.
  short: 'G. Engels, P. Löhr, in: Proceedings of the 2nd International East/West Database
    Workshop, Klagenfurt (Germany), Springer, Berlin/Heidelberg, 1994, pp. 303–314.'
date_created: 2019-03-04T11:52:15Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
language:
- iso: eng
page: 303-314
place: Berlin/Heidelberg
publication: Proceedings of the 2nd International East/West Database Workshop, Klagenfurt
  (Germany)
publisher: Springer
status: public
title: Visual Specification of Complex Database Actions
type: conference
user_id: '52534'
year: '1994'
...
---
_id: '7407'
author:
- first_name: Perdita
  full_name: Löhr-Richter, Perdita
  last_name: Löhr-Richter
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: Löhr-Richter P, Engels G. Visuelles Spezifizieren von komplexen Aktionen auf
    Datenbankstrukturen. <i>GI-Datenbank Rundbrief</i>. 1994;13:33-35.
  apa: Löhr-Richter, P., &#38; Engels, G. (1994). Visuelles Spezifizieren von komplexen
    Aktionen auf Datenbankstrukturen. <i>GI-Datenbank Rundbrief</i>, <i>13</i>, 33–35.
  bibtex: '@article{Löhr-Richter_Engels_1994, title={Visuelles Spezifizieren von komplexen
    Aktionen auf Datenbankstrukturen}, volume={13}, journal={GI-Datenbank Rundbrief},
    author={Löhr-Richter, Perdita and Engels, Gregor}, year={1994}, pages={33–35}
    }'
  chicago: 'Löhr-Richter, Perdita, and Gregor Engels. “Visuelles Spezifizieren von
    Komplexen Aktionen Auf Datenbankstrukturen.” <i>GI-Datenbank Rundbrief</i> 13
    (1994): 33–35.'
  ieee: P. Löhr-Richter and G. Engels, “Visuelles Spezifizieren von komplexen Aktionen
    auf Datenbankstrukturen,” <i>GI-Datenbank Rundbrief</i>, vol. 13, pp. 33–35, 1994.
  mla: Löhr-Richter, Perdita, and Gregor Engels. “Visuelles Spezifizieren von Komplexen
    Aktionen Auf Datenbankstrukturen.” <i>GI-Datenbank Rundbrief</i>, vol. 13, 1994,
    pp. 33–35.
  short: P. Löhr-Richter, G. Engels, GI-Datenbank Rundbrief 13 (1994) 33–35.
date_created: 2019-01-31T15:52:25Z
date_updated: 2022-01-06T07:03:36Z
department:
- _id: '66'
intvolume: '        13'
language:
- iso: eng
page: 33-35
publication: GI-Datenbank Rundbrief
status: public
title: Visuelles Spezifizieren von komplexen Aktionen auf Datenbankstrukturen
type: journal_article
user_id: '52534'
volume: 13
year: '1994'
...
---
_id: '7512'
abstract:
- lang: eng
  text: This article gives an overview on how to represent the outcome of the software
    design phase in design documents. The descriptive aspects of the design description
    languages are stressed. The focus is on sequential systems and the description
    is arranged according to the main paradigms that are used in indentifying software
    components. Following a general discussion on how to represent software architectures
    of large systems, each design paradigm is discussend separately with its basic
    concepts, its historical background and its main variants. Some multiparadigmatic
    approaches are discussed, as well which integrate several of the aspects introduced
    before.
author:
- first_name: Jürgen
  full_name: Ebert, Jürgen
  last_name: Ebert
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: 'Ebert J, Engels G. Design Representation. In: <i>Encyclopedia of Software
    Engineering</i>. John Wiley &#38; Sons, Inc.; 1994:382-394.'
  apa: Ebert, J., &#38; Engels, G. (1994). Design Representation. In <i>Encyclopedia
    of Software Engineering</i> (pp. 382–394). John Wiley &#38; Sons, Inc.
  bibtex: '@inbook{Ebert_Engels_1994, title={Design Representation}, booktitle={Encyclopedia
    of Software Engineering}, publisher={John Wiley &#38; Sons, Inc.}, author={Ebert,
    Jürgen and Engels, Gregor}, year={1994}, pages={382–394} }'
  chicago: Ebert, Jürgen, and Gregor Engels. “Design Representation.” In <i>Encyclopedia
    of Software Engineering</i>, 382–94. John Wiley &#38; Sons, Inc., 1994.
  ieee: J. Ebert and G. Engels, “Design Representation,” in <i>Encyclopedia of Software
    Engineering</i>, John Wiley &#38; Sons, Inc., 1994, pp. 382–394.
  mla: Ebert, Jürgen, and Gregor Engels. “Design Representation.” <i>Encyclopedia
    of Software Engineering</i>, John Wiley &#38; Sons, Inc., 1994, pp. 382–94.
  short: 'J. Ebert, G. Engels, in: Encyclopedia of Software Engineering, John Wiley
    &#38; Sons, Inc., 1994, pp. 382–394.'
date_created: 2019-02-04T22:39:16Z
date_updated: 2022-01-06T07:03:39Z
department:
- _id: '66'
language:
- iso: eng
page: 382-394
publication: Encyclopedia of Software Engineering
publisher: John Wiley & Sons, Inc.
status: public
title: Design Representation
type: book_chapter
user_id: '52534'
year: '1994'
...
---
_id: '7513'
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Luuk
  full_name: Groenewegen, Luuk
  last_name: Groenewegen
citation:
  ama: 'Engels G, Groenewegen L. SOCCA: Specifications of Coordinated and Cooperative
    Activities. In: <i>Software Process Modelling and Technology</i>. Taunton: Research
    Studies Press; 1994:71-102.'
  apa: 'Engels, G., &#38; Groenewegen, L. (1994). SOCCA: Specifications of Coordinated
    and Cooperative Activities. In <i>Software Process Modelling and Technology</i>
    (pp. 71–102). Taunton: Research Studies Press.'
  bibtex: '@inbook{Engels_Groenewegen_1994, place={Taunton}, title={SOCCA: Specifications
    of Coordinated and Cooperative Activities}, booktitle={Software Process Modelling
    and Technology}, publisher={Research Studies Press}, author={Engels, Gregor and
    Groenewegen, Luuk}, year={1994}, pages={71–102} }'
  chicago: 'Engels, Gregor, and Luuk Groenewegen. “SOCCA: Specifications of Coordinated
    and Cooperative Activities.” In <i>Software Process Modelling and Technology</i>,
    71–102. Taunton: Research Studies Press, 1994.'
  ieee: 'G. Engels and L. Groenewegen, “SOCCA: Specifications of Coordinated and Cooperative
    Activities,” in <i>Software Process Modelling and Technology</i>, Taunton: Research
    Studies Press, 1994, pp. 71–102.'
  mla: 'Engels, Gregor, and Luuk Groenewegen. “SOCCA: Specifications of Coordinated
    and Cooperative Activities.” <i>Software Process Modelling and Technology</i>,
    Research Studies Press, 1994, pp. 71–102.'
  short: 'G. Engels, L. Groenewegen, in: Software Process Modelling and Technology,
    Research Studies Press, Taunton, 1994, pp. 71–102.'
date_created: 2019-02-04T22:40:13Z
date_updated: 2022-01-06T07:03:39Z
department:
- _id: '66'
language:
- iso: eng
page: 71-102
place: Taunton
publication: Software Process Modelling and Technology
publisher: Research Studies Press
status: public
title: 'SOCCA: Specifications of Coordinated and Cooperative Activities'
type: book_chapter
user_id: '52534'
year: '1994'
...
---
_id: '7826'
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: A.A.
  full_name: Verrijn-Stuart, A.A.
  last_name: Verrijn-Stuart
citation:
  ama: 'Engels G, Verrijn-Stuart AA. Integrationsaspekte bei verteilter Software-Entwicklung.
    In: <i>Fortschritt-Berichte VDI</i>. Reihe 10: Informatik/Kommunikationstechnik.
    VDI Verlag; 1993:45-53.'
  apa: Engels, G., &#38; Verrijn-Stuart, A. A. (1993). Integrationsaspekte bei verteilter
    Software-Entwicklung. In <i>Fortschritt-Berichte VDI</i> (pp. 45–53). VDI Verlag.
  bibtex: '@inproceedings{Engels_Verrijn-Stuart_1993, series={Reihe 10: Informatik/Kommunikationstechnik},
    title={Integrationsaspekte bei verteilter Software-Entwicklung}, number={251},
    booktitle={Fortschritt-Berichte VDI}, publisher={VDI Verlag}, author={Engels,
    Gregor and Verrijn-Stuart, A.A.}, year={1993}, pages={45–53}, collection={Reihe
    10: Informatik/Kommunikationstechnik} }'
  chicago: 'Engels, Gregor, and A.A. Verrijn-Stuart. “Integrationsaspekte Bei Verteilter
    Software-Entwicklung.” In <i>Fortschritt-Berichte VDI</i>, 45–53. Reihe 10: Informatik/Kommunikationstechnik.
    VDI Verlag, 1993.'
  ieee: G. Engels and A. A. Verrijn-Stuart, “Integrationsaspekte bei verteilter Software-Entwicklung,”
    in <i>Fortschritt-Berichte VDI</i>, 1993, no. 251, pp. 45–53.
  mla: Engels, Gregor, and A. A. Verrijn-Stuart. “Integrationsaspekte Bei Verteilter
    Software-Entwicklung.” <i>Fortschritt-Berichte VDI</i>, no. 251, VDI Verlag, 1993,
    pp. 45–53.
  short: 'G. Engels, A.A. Verrijn-Stuart, in: Fortschritt-Berichte VDI, VDI Verlag,
    1993, pp. 45–53.'
date_created: 2019-02-20T13:51:38Z
date_updated: 2022-01-06T07:03:46Z
department:
- _id: '66'
issue: '251'
language:
- iso: eng
page: 45-53
publication: Fortschritt-Berichte VDI
publisher: VDI Verlag
series_title: 'Reihe 10: Informatik/Kommunikationstechnik'
status: public
title: Integrationsaspekte bei verteilter Software-Entwicklung
type: conference
user_id: '52534'
year: '1993'
...
---
_id: '8190'
author:
- first_name: Marc
  full_name: Andries, Marc
  last_name: Andries
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: Andries M, Engels G. <i>A Hybrid Query Language for the Extended Entity Relationship
    Model</i>. Vakgroep Informatica, Rijksuniversiteit Leiden; 1993.
  apa: Andries, M., &#38; Engels, G. (1993). <i>A Hybrid Query Language for the Extended
    Entity Relationship Model</i>. Vakgroep Informatica, Rijksuniversiteit Leiden.
  bibtex: '@book{Andries_Engels_1993, title={A Hybrid Query Language for the Extended
    Entity Relationship Model}, publisher={Vakgroep Informatica, Rijksuniversiteit
    Leiden}, author={Andries, Marc and Engels, Gregor}, year={1993} }'
  chicago: Andries, Marc, and Gregor Engels. <i>A Hybrid Query Language for the Extended
    Entity Relationship Model</i>. Vakgroep Informatica, Rijksuniversiteit Leiden,
    1993.
  ieee: M. Andries and G. Engels, <i>A Hybrid Query Language for the Extended Entity
    Relationship Model</i>. Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
  mla: Andries, Marc, and Gregor Engels. <i>A Hybrid Query Language for the Extended
    Entity Relationship Model</i>. Vakgroep Informatica, Rijksuniversiteit Leiden,
    1993.
  short: M. Andries, G. Engels, A Hybrid Query Language for the Extended Entity Relationship
    Model, Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
date_created: 2019-03-03T16:12:44Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
language:
- iso: eng
publisher: Vakgroep Informatica, Rijksuniversiteit Leiden
report_number: 93-15
status: public
title: A Hybrid Query Language for the Extended Entity Relationship Model
type: report
user_id: '52534'
year: '1993'
...
---
_id: '8191'
author:
- first_name: Hartmut
  full_name: Ehrig, Hartmut
  last_name: Ehrig
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: Ehrig H, Engels G. <i>Towards a Module Concept for Graph Transformation Systems</i>.
    Vakgroep Informatica, Rijksuniversiteit Leiden; 1993.
  apa: Ehrig, H., &#38; Engels, G. (1993). <i>Towards a Module Concept for Graph Transformation
    Systems</i>. Vakgroep Informatica, Rijksuniversiteit Leiden.
  bibtex: '@book{Ehrig_Engels_1993, title={Towards a Module Concept for Graph Transformation
    Systems}, publisher={Vakgroep Informatica, Rijksuniversiteit Leiden}, author={Ehrig,
    Hartmut and Engels, Gregor}, year={1993} }'
  chicago: Ehrig, Hartmut, and Gregor Engels. <i>Towards a Module Concept for Graph
    Transformation Systems</i>. Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
  ieee: H. Ehrig and G. Engels, <i>Towards a Module Concept for Graph Transformation
    Systems</i>. Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
  mla: Ehrig, Hartmut, and Gregor Engels. <i>Towards a Module Concept for Graph Transformation
    Systems</i>. Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
  short: H. Ehrig, G. Engels, Towards a Module Concept for Graph Transformation Systems,
    Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
date_created: 2019-03-03T16:12:46Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
language:
- iso: eng
publisher: Vakgroep Informatica, Rijksuniversiteit Leiden
report_number: 93-34
status: public
title: Towards a Module Concept for Graph Transformation Systems
type: report
user_id: '52534'
year: '1993'
...
---
_id: '8192'
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Grzegorz
  full_name: Rozenberg, Grzegorz
  last_name: Rozenberg
citation:
  ama: Engels G, Rozenberg G. <i>Abstracts COMPUGRAPH II Workshop</i>. Vakgroep Informatica,
    Rijksuniversiteit Leiden; 1993.
  apa: Engels, G., &#38; Rozenberg, G. (1993). <i>Abstracts COMPUGRAPH II Workshop</i>.
    Vakgroep Informatica, Rijksuniversiteit Leiden.
  bibtex: '@book{Engels_Rozenberg_1993, title={Abstracts COMPUGRAPH II Workshop},
    publisher={Vakgroep Informatica, Rijksuniversiteit Leiden}, author={Engels, Gregor
    and Rozenberg, Grzegorz}, year={1993} }'
  chicago: Engels, Gregor, and Grzegorz Rozenberg. <i>Abstracts COMPUGRAPH II Workshop</i>.
    Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
  ieee: G. Engels and G. Rozenberg, <i>Abstracts COMPUGRAPH II Workshop</i>. Vakgroep
    Informatica, Rijksuniversiteit Leiden, 1993.
  mla: Engels, Gregor, and Grzegorz Rozenberg. <i>Abstracts COMPUGRAPH II Workshop</i>.
    Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
  short: G. Engels, G. Rozenberg, Abstracts COMPUGRAPH II Workshop, Vakgroep Informatica,
    Rijksuniversiteit Leiden, 1993.
date_created: 2019-03-03T16:12:47Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
language:
- iso: eng
publisher: Vakgroep Informatica, Rijksuniversiteit Leiden
report_number: 93-26
status: public
title: Abstracts COMPUGRAPH II Workshop
type: report
user_id: '52534'
year: '1993'
...
---
_id: '8262'
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
- first_name: Luuk
  full_name: Groenewegen, Luuk
  last_name: Groenewegen
citation:
  ama: 'Engels G, Groenewegen L. Modular, Visual Specifications of Software Processes.
    In: <i>Proceedings of the Workshop on Software Process (ISPW 1993), Wadern (Germany)</i>.
    Washington, DC, USA: IEEE Computer Society; 1993:66-68.'
  apa: 'Engels, G., &#38; Groenewegen, L. (1993). Modular, Visual Specifications of
    Software Processes. In <i>Proceedings of the Workshop on Software Process (ISPW
    1993), Wadern (Germany)</i> (pp. 66–68). Washington, DC, USA: IEEE Computer Society.'
  bibtex: '@inproceedings{Engels_Groenewegen_1993, place={Washington, DC, USA}, title={Modular,
    Visual Specifications of Software Processes}, booktitle={Proceedings of the Workshop
    on Software Process (ISPW 1993), Wadern (Germany)}, publisher={IEEE Computer Society},
    author={Engels, Gregor and Groenewegen, Luuk}, year={1993}, pages={66–68} }'
  chicago: 'Engels, Gregor, and Luuk Groenewegen. “Modular, Visual Specifications
    of Software Processes.” In <i>Proceedings of the Workshop on Software Process
    (ISPW 1993), Wadern (Germany)</i>, 66–68. Washington, DC, USA: IEEE Computer Society,
    1993.'
  ieee: G. Engels and L. Groenewegen, “Modular, Visual Specifications of Software
    Processes,” in <i>Proceedings of the Workshop on Software Process (ISPW 1993),
    Wadern (Germany)</i>, 1993, pp. 66–68.
  mla: Engels, Gregor, and Luuk Groenewegen. “Modular, Visual Specifications of Software
    Processes.” <i>Proceedings of the Workshop on Software Process (ISPW 1993), Wadern
    (Germany)</i>, IEEE Computer Society, 1993, pp. 66–68.
  short: 'G. Engels, L. Groenewegen, in: Proceedings of the Workshop on Software Process
    (ISPW 1993), Wadern (Germany), IEEE Computer Society, Washington, DC, USA, 1993,
    pp. 66–68.'
date_created: 2019-03-04T11:52:12Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
language:
- iso: eng
page: 66-68
place: Washington, DC, USA
publication: Proceedings of the Workshop on Software Process (ISPW 1993), Wadern (Germany)
publisher: IEEE Computer Society
status: public
title: Modular, Visual Specifications of Software Processes
type: conference
user_id: '52534'
year: '1993'
...
---
_id: '7825'
author:
- first_name: Pieter
  full_name: Koopman, Pieter
  last_name: Koopman
- first_name: Luuk
  full_name: Groenewegen, Luuk
  last_name: Groenewegen
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: 'Koopman P, Groenewegen L, Engels G. Functional Description of Parallel Processes.
    In: <i>Proceedings of the Conference SION Computing Science in the Netherlands
    (CSN ’92), The Netherlands</i>. ; 1992:156-167.'
  apa: Koopman, P., Groenewegen, L., &#38; Engels, G. (1992). Functional Description
    of Parallel Processes. In <i>Proceedings of the conference SION Computing Science
    in the Netherlands (CSN ’92), The Netherlands</i> (pp. 156–167).
  bibtex: '@inproceedings{Koopman_Groenewegen_Engels_1992, title={Functional Description
    of Parallel Processes}, booktitle={Proceedings of the conference SION Computing
    Science in the Netherlands (CSN ’92), The Netherlands}, author={Koopman, Pieter
    and Groenewegen, Luuk and Engels, Gregor}, year={1992}, pages={156–167} }'
  chicago: Koopman, Pieter, Luuk Groenewegen, and Gregor Engels. “Functional Description
    of Parallel Processes.” In <i>Proceedings of the Conference SION Computing Science
    in the Netherlands (CSN ’92), The Netherlands</i>, 156–67, 1992.
  ieee: P. Koopman, L. Groenewegen, and G. Engels, “Functional Description of Parallel
    Processes,” in <i>Proceedings of the conference SION Computing Science in the
    Netherlands (CSN ’92), The Netherlands</i>, 1992, pp. 156–167.
  mla: Koopman, Pieter, et al. “Functional Description of Parallel Processes.” <i>Proceedings
    of the Conference SION Computing Science in the Netherlands (CSN ’92), The Netherlands</i>,
    1992, pp. 156–67.
  short: 'P. Koopman, L. Groenewegen, G. Engels, in: Proceedings of the Conference
    SION Computing Science in the Netherlands (CSN ’92), The Netherlands, 1992, pp.
    156–167.'
date_created: 2019-02-20T13:51:12Z
date_updated: 2022-01-06T07:03:46Z
department:
- _id: '66'
language:
- iso: eng
page: 156-167
publication: Proceedings of the conference SION Computing Science in the Netherlands
  (CSN '92), The Netherlands
status: public
title: Functional Description of Parallel Processes
type: conference
user_id: '52534'
year: '1992'
...
---
_id: '8189'
author:
- first_name: Gregor
  full_name: Engels, Gregor
  id: '107'
  last_name: Engels
citation:
  ama: Engels G. <i>Visual Specifications of Conceptual Database Schemata (Abstract)</i>.
    Leiden University; 1992.
  apa: Engels, G. (1992). <i>Visual Specifications of Conceptual Database Schemata
    (Abstract)</i>. Leiden University.
  bibtex: '@book{Engels_1992, title={Visual Specifications of Conceptual Database
    Schemata (Abstract)}, publisher={Leiden University}, author={Engels, Gregor},
    year={1992} }'
  chicago: Engels, Gregor. <i>Visual Specifications of Conceptual Database Schemata
    (Abstract)</i>. Leiden University, 1992.
  ieee: G. Engels, <i>Visual Specifications of Conceptual Database Schemata (Abstract)</i>.
    Leiden University, 1992.
  mla: Engels, Gregor. <i>Visual Specifications of Conceptual Database Schemata (Abstract)</i>.
    Leiden University, 1992.
  short: G. Engels, Visual Specifications of Conceptual Database Schemata (Abstract),
    Leiden University, 1992.
date_created: 2019-03-03T16:12:43Z
date_updated: 2022-01-06T07:03:52Z
department:
- _id: '66'
language:
- iso: eng
publisher: Leiden University
status: public
title: Visual Specifications of Conceptual Database Schemata (Abstract)
type: report
user_id: '52534'
year: '1992'
...