TEST :Syntax Checking (id, ref) : Test content: only one is allow (all | choice | sequence), choice follow by all
http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/#cModel_Group_Definitions
| Item | Value | 
|---|---|
| title | groupO019 - groupO019 | 
| name | groupO019 | 
| source | ../groupO019.xsd | 
| schemaName | ../groupO019.xsd | 
| keywords | schema negative | 
| package | javasoft.sqe.tests.group.groupo019 |