RE: Were these derived from a logical data model: XSLT, XML Sc
Liam Quin wrote: > XSLT 2 is built on a logical data model, although > not one described in terms of relational algebra. Thanks Liam. I took a look at the XPath Data Model . It's all prose. There are no UML-type diagrams. In fact, I can't find any documents on XSLT, XML Schema, XHTML, or Schematron that contain UML- or ER-type diagrams. The documents are all prose. The prose defines and describes concepts at an abstract (infoset) level. As far as I can tell, the "logical data model" used to create an XML vocabulary is different than the "logical data model" used to create a database- or object-system. Here are the differences that I see: Creating a database or object system involves: . create UML- or ER-type diagrams, and then . create the database or object system directly from those diagrams. Conversely, creating an XML vocabulary involves: . define and describe in prose the concepts at an abstract (infoset) level, and then . create a specification from that prose, and then . create an XML Schema or DTD or Relax NG schema. Do you agree? /Roger  http://www.w3.org/TR/xpath-datamodel/#dt-instance
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