CDR Tickets

The Problem:
CDR schema validation is currently performed using a custom C++ implementation based on the draft XML Schema standard. When the standard was released in its final form, there were significantly more substantive changes from the draft than the committee had predicted. As a result, our schema documents are not compliant with the standard and are only usable by our own software.

The Question:
Is it possible to replace the existing validation module with a standards-compliant version, so that our schemas could be used outside the CDR (e.g., by the WCMS, the PDQ data partners, or the front-end editing package XMetaL)?

Objectives of this Spike Story:
Implement prototype software which can:

• make the existing schema documents compliant with the XML Schema standard

• produce correct DTDs from the modified schemas

• validate CDR document from the modified schemas, producing the same results as the legacy server produces

• run custom validation rules embedded in the schemas, producing the same results as the legacy server produces

• embed validation error information in CDR documents sent back to XMetaL