NEW ISSUE: Schema does not contain SecurityTokenRereference

Title: Schema does not contain SecurityTokenRereference

Description:
Schema in Appendix A does not contain SecurityTokenRereference but 
section 3.4 does.

Justification:
Inconsistency between the spec and the schema.

Target: core, schema

Type: editorial

Proposal:
Once issue i029 is resolved, either fix the schema or the spec so that 
they match.

Related issues: i029