Saxon

Legacy ID: #5757489 Legacy Poster: julianhall (julianhall)

Hi, I'm attempting to replace a DataSet/DataTable implementation in our application for performance reasons... Our DataTable xml structure (don't ask why) is as follows: <DataTable> <r><h>fieldName 1</h>...<h>fieldName N</h></r> <r><d> value1 </d>...<d> valueN </h></r> ... <r><d> value1 </d>...<d> valueN </h></r> </DataTable> and our DataSet structure can contain many DataTables: <DataSet> <DataTable>* </DataSet When I create a DataTable instance from a file i use the document builder to read the document and save the DataTable node: tableNode = (XdmNode)tableDocument.axisIterator(Axis.CHILD).next(); I want to select a field value I run the following xpath query on the tableNode: r[$rowNum+2]/d[index-of( //DataTable/r/h/text() , $fieldName)]/text() and everything is fine. I can just as easily run this query as well and it works: r[$rowNum+2]/d[index-of( //r/h/text() , $fieldName)]/text() My real problem is that when I try to use the same xpath functions on a DataTable XdmNode taken from a DataSet .. i always get a null value? Here are my methods that i'm using: public XdmValue executeXPath(String query, XdmItem item, Map<QName, XdmValue> values) throws SaxonApiException, IOException { XPathSelector selector = getXPathSelector(query,values); selector.setContextItem(item); setVariables(values, selector); return selector.evaluate(); } private XPathSelector getXPathSelector(String query, Map<QName, XdmValue> values) throws SaxonApiException { XPathCompiler xpc = _processor.newXPathCompiler(); declareVariables(values,xpc); XPathExecutable exp = xpc.compile(getFileContents(query)); XPathSelector selector = exp.load(); return selector; } Any help on this would be greatly appreciated. Thanks, Julian