Code review comment for lp:~zorba-coders/zorba/bug1147563

A few comments:
 - for following method, getting the type of the content of a global element shouldn't have anything to do with element's nillable property. Please add a different method to return the nillable of a global element or it's definition.

void Schema::getTypeNameFromElementName(
 const store::Item* qname,
 store::Item_t& typeName,
>>> + bool& nillable,
 const QueryLoc& loc);

Same comment goes for:
 - CTX_TM->get_schema_element_typename(elemQNameItem, typeQNameItem, nillable, loc);
 - Schema:: createXQTypeFromElementName(typeManager,
503 + sourceNode->getNodeName(),
504 + false,
505 + nillable,
506 + loc);