TEST :Identity-constraint Definition Schema Component : keyref element, content of annotation then field
http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/#cIdentity-constraint_Definitions
| Item | Value | 
|---|---|
| title | idC051 - idC051 | 
| name | idC051 | 
| source | ../idC051.xsd | 
| schemaName | ../idC051.xsd | 
| keywords | schema negative | 
| package | javasoft.sqe.tests.identityconstraint.idc051 |