PHP4, domxml and xpath with Namespaces

Hi, I haven't yet worked with namespaces in XML before when it comes to DOM related methods. My source is an Office 2003 Excel XML and it contains XML like: <?xml version="1.0"?> <?mso-application progid="Excel.Sheet"?> <Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:html="http://www.w3.org/TR/REC-html40"> <DocumentProperties xmlns="urn:schemas-microsoft-com:office:office"/> <Worksheet ss:Name="Sheet1"> <Table ss:ExpandedColumnCount="256" ss:ExpandedRowCount="670" x:FullColumns="1" x:FullRows="1" ss:DefaultColumnWidth="60"> <Column ss:StyleID="s22" ss:AutoFitWidth="0" ss:Width="284.25"/> <Row> How can I use an xpath expression to find e.g. all rows in Worksheet "Sheet1" ? My problem here is that the name of the Worksheet is in a namespace attribute and I don't know how to express this as an xpath expression. The following doesn't work, always returns an empty nodeset to me: Worksheet[@ss:Name='Sheet1'] Can someone give me a push into the right direction? thanks, - Markus