Revamped external function result trees

* the root node of the result tree of each function is a domain element
** i.e. the root node of "read-xml-file" is "file", the root node of "read-directory" is "directory"
* the root node contains the result state of the function call encoded in a "result" attribute
** possible values are "success" and "error"
** the root node may contain additional attributes such as the target path of a called transformation
* the actual function result is contained within the child nodes of the function root node
** i.e. the XML file tree returned by "read-xml-file" is a child of the function root node
** if specific errors occured they are also returned as child nodes of the function root node
*** this is currently only the case for "transform" where transformation errors are returned as "error" value node childs of the function root node
* updated test cases accordingly

1 files changed, 6 insertions, 2 deletions

diff --git a/src/function/transform.cc b/src/function/transform.cc
index e952018..ab8c51c 100644
--- a/src/function/transform.cc
+++ b/src/function/transform.cc
@@ -38,8 +38,8 @@ xercesc::DOMDocument* FunctionTransform::constructDocument(
 		domDocument->getDocumentElement()
 	);
 
-	ResultNodeFacade result(domDocument, rootNode, "result");
-	result.setAttribute("name", targetPath);
+	ResultNodeFacade result(domDocument, rootNode, "transformation");
+	result.setAttribute("target", targetPath);
 
 	try {
 		InputXSLT::TransformationFacade transformation(
@@ -48,8 +48,12 @@ xercesc::DOMDocument* FunctionTransform::constructDocument(
 		);
 
 		transformation.generate(targetPath, parameterObject);
+
+		result.setAttribute("result", "success");
 	}
 	catch (const ErrorCapacitor::exception& exception) {
+		result.setAttribute("result", "error");
+
 		for ( auto&& error : *(exception.getCachedErrors()) ) {
 			result.setValueNode("error", error);
 		}