/** INTERNAL: Allow the use of XMLType operators on this platform. */ protected void initializePlatformOperators() { super.initializePlatformOperators(); addOperator(ExpressionOperator.extract()); addOperator(ExpressionOperator.extractValue()); addOperator(ExpressionOperator.existsNode()); addOperator(ExpressionOperator.isFragment()); addOperator(ExpressionOperator.getStringVal()); addOperator(ExpressionOperator.getNumberVal()); addOperator(SpatialExpressionOperators.withinDistance()); addOperator(SpatialExpressionOperators.relate()); addOperator(SpatialExpressionOperators.filter()); addOperator(SpatialExpressionOperators.nearestNeighbor()); }