Added "Particle correct 2" to parsing of model groups. Added handling
* xmlschemas.c: Added "Particle correct 2" to parsing of model groups. Added handling substitution groups inside <choice> and <sequence>; for <all> this is not supported yet. Changed circular checks for model groups definitions. "memberTypes" are processed at different levels now: component resolution first, construction later; this goes hand in hand with a global change to handle component resolution in a distinct phase. Fixed invalid default values for elements to mark the schema as invalid; this just resulted in an error report previously, but the schema was handled as valid. Separated the assignment of the model groups to referencing model group definition references (i.e. particles); this was needed to perform the circularity check for model group definitions. Added "Element Declaration Properties Correct (e-props-correct)" constraints. Separated component resolution for simple/complex types. * include/libxml/schemasInternals.h: Added a flag for substitution group heads.
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