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Data model vocabulary


Currently my company is working on the creation of one application to navigate a data model currently represented as XML Schemas (a lot of them) and external Spreadsheets to keep its Data Dictionary in various languages.

The first step we want to take, is to create unified Data Model files that combine the information stored in the schemas and the spreadsheets, and then create an application, using XML technologies, to allow the user navigate this model in multiple languages.

Before spending a lot of time creating our own vocabulary and converting the XML schemas to it, I want to know if such vocabulary already exists.

This is the requirements list:
- Must be an XML vocabulary 
- Must Support standard XML Schema constraints: data types, cardinality, etc.
- Should Support for XPath validation (assertions) like Schematron, RelaxNG
- Must be convertible from/to XML Schema 
- Must support human-readable definitions of every element in various languages.
- Should be extensible to support custom properties for every element
- Desirable: support for modeling graphs (no just trees of data). 

Somebody here could recommend an XML vocabulary for this task?

Is better to create a new vocabulary that supersedes XML Schema? Will it be useful for some of you?

Thank you for sharing your wisdom,

William David Velásquez
Director de Investigación y Desarrollo
Visión Tecnológica S.A.S.
Tel (57 4) 444 7292
Movil (57) 311 709 8421
Follow me @williamda

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