question: public XSWildcardDecl performIntersectionWith ( XSWildcardDecl wildcard , short processContents ) { if ( wildcard == null ) return null ; XSWildcardDecl intersectWildcard = new XSWildcardDecl ( ) ; intersectWildcard . fProcessContents = processContents ; if ( areSame ( wildcard ) ) { intersectWildcard . fType = fType ; intersectWildcard . fNamespaceList = fNamespaceList ; } else if ( ( fType == NSCONSTRAINT_ANY ) || ( wildcard . fType == NSCONSTRAINT_ANY ) ) { XSWildcardDecl other = this ; if ( fType == NSCONSTRAINT_ANY ) other = wildcard ; intersectWildcard . fType = other . fType ; intersectWildcard . fNamespaceList = other . fNamespaceList ; } else if ( ( ( fType == NSCONSTRAINT_NOT ) && ( wildcard . fType == NSCONSTRAINT_LIST ) ) || ( ( fType == NSCONSTRAINT_LIST ) && ( wildcard . fType == NSCONSTRAINT_NOT ) ) ) { String [ ] list = null ; String [ ] other = null ; if ( fType == NSCONSTRAINT_NOT ) { other = fNamespaceList ; list = wildcard . fNamespaceList ; } else { other = wildcard . fNamespaceList ; list = fNamespaceList ; } int listSize = list . length ; String [ ] intersect = new String [ listSize ] ; int newSize = 0 ; for ( int i = 0 ; i < listSize ; i ++ ) { if ( list [ i ] != other [ 0 ] && list [ i ] != ABSENT ) intersect [ newSize ++ ] = list [ i ] ; } intersectWildcard . fType = NSCONSTRAINT_LIST ; intersectWildcard . fNamespaceList = new String [ newSize ] ; System . arraycopy ( intersect , 0 , intersectWildcard . fNamespaceList , 0 , newSize ) ; } else if ( ( fType == NSCONSTRAINT_LIST ) && ( wildcard . fType == NSCONSTRAINT_LIST ) ) { intersectWildcard . fType = NSCONSTRAINT_LIST ; intersectWildcard . fNamespaceList = intersect2sets ( fNamespaceList , wildcard . fNamespaceList ) ; } else if ( fType == NSCONSTRAINT_NOT && wildcard . fType == NSCONSTRAINT_NOT ) { if ( fNamespaceList [ 0 ] != ABSENT && wildcard . fNamespaceList [ 0 ] != ABSENT ) return null ; XSWildcardDecl other = this ; if ( fNamespaceList [ 0 ] == ABSENT ) other = wildcard ; intersectWildcard . fType = other . fType ; intersectWildcard . fNamespaceList = other . fNamespaceList ; } return intersectWildcard ; }
target:  Schema Component Constraint: Attribute Wildcard Intersection