TEST :model groups (ALL) : 'all', appear under 'extension', which is part of a complexType, and has minOccurs=1, maxOccurs=2
http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/#Model_Groups
| Item | Value | 
|---|---|
| title | mgP042 - mgP042 | 
| name | mgP042 | 
| source | ../mgP042.xsd | 
| schemaName | ../mgP042.xsd | 
| keywords | schema negative | 
| package | javasoft.sqe.tests.modelgroups.mgp042 |