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Re: [xml-dev] XML Schema as a data modeling tool

Original ideas:

  author    = {E. F. Codd},
  title     = {Derivability, Redundancy and Consistency of Relations Stored
               in Large Data Banks},
  journal   = {IBM Research Report, San Jose, California},
  volume    = {RJ599},
  year      = {1969},
  ee        = {db/labs/ibm/RJ599.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}


  author    = {E. F. Codd},
  title     = {Further Normalization of the Data Base Relational Model},
  journal   = {IBM Research Report, San Jose, California},
  volume    = {RJ909},
  year      = {1971},
  ee        = {db/labs/ibm/RJ909.html},
  bibsource = {DBLP, http://dblp.uni-trier.de}
In Peter Chen's 1976 paper he specifically mentions the relational model in the abstract
"A data model, called the entity-relationship model, is proposed. This model incorporates some of the important semantic information about the real world. A special diagrammatic technique is introduced as a tool for database design. An example of database design and description using the model and the diagrammatic technique is given. Some implications for data integrity, infor-mation retrieval, and data manipulation are discussed. The entity-relationship model can be used as a basis for unification of different views of data: t,he network model, the relational model, and the entity set model. Semantic ambiguities in these models are analyzed. Possible ways to derive their views of data from the entity-relationship model are presented. Key Words and Phrases: database design, logical view of data, semantics of data, data models, entity-relationship model, relational model, Data Base Task Group, network model, entity set"

So, I am not sure why you (Michael) think they got their history wrong?


On Fri, Oct 4, 2013 at 7:12 AM, Stephen Cameron <steve.cameron.62@gmail.com> wrote:

The Entity-Relationship Model: Toward a Unified View of Data (1976) by Peter Pin-shan Chen
A relational model of data for large shared data banks (1983) by E F Codd

On Fri, Oct 4, 2013 at 5:10 PM, Michael Kay <mike@saxonica.com> wrote:

On 4 Oct 2013, at 00:03, Stephen Cameron wrote:

The introduction
of the relational data model had sparked Entity Relationship Modeling

Oh dear. If they get their history wrong in the second paragraph, it makes me stop reading. ERM was in widespread use long before significant take-up of the relational model.

Michael Kay

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