I found a workaround by extending the PackageDescr. If somebody cares here is my solution to it: public class MergeablePackageDescr extends PackageDescr{ public void merge(PackageDescr packageDescr){ for(AttributeDescr attribue : packageDescr.getAttributes()){ if(!this.getAttributes().contains(attribue)){ this.addAttribute(attribue); } } for(FunctionImportDescr funktionimport : packageDescr.getFunctionImports()){ if(!this.getFunctionImports().contains(funktionimport)){ this.addFunctionImport(funktionimport); } } for(FunctionDescr function : packageDescr.getFunctions()){ if(!this.getFunctions().contains(function)){ this.addFunction(function); } } for(GlobalDescr global : packageDescr.getGlobals()){ if(!this.getGlobals().contains(global)){ this.addGlobal(global); } } for(ImportDescr importdes : packageDescr.getImports()){ if(!this.getImports().contains(importdes)){ this.addImport(importdes); } } for(RuleDescr rule : packageDescr.getRules()){ if(!this.getRules().contains(rule)){ this.addRule(rule); } } } } -- View this message in context: http://drools.46999.n3.nabble.com/Merging-two-XML-rules-into-a-single-XML... Sent from the Drools: User forum mailing list archive at Nabble.com.