question: public UnionPathIterator ( Compiler compiler , int opPos ) throws javax . xml . transform . TransformerException { super ( ) ; opPos = OpMap . getFirstChildPos ( opPos ) ; loadLocationPaths ( compiler , opPos , 0 ) ; }
target:  Create a UnionPathIterator object, including creation  of location path iterators from the opcode list, and call back  into the Compiler to create predicate expressions.