Convenience method which checks if this type is derived from the given ancestor type.
@param namespace An ancestor type namespace.
@param name An ancestor type name.
@param derivationMethod A bit combination representing a subset of {DERIVATION_RESTRICTION, DERIVATION_EXTENSION, DERIVATION_UNION, DERIVATION_LIST }.
@return True if this type is derived from ancestorType using only derivation methods from the derivationMethod .
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