使用XSLT将OpenOffice / Libreoffic .fodg文件转换为graphml时出现问题

I am new to XSLT and trying to convert a Libre-/Openoffice drawing to a .graphml file for import into yEd. To do the transformation I started using the Notepad++/XML Tools and also the XML Xopy Editor. But I am stuck in getting the elements with their namespace identified. So I am not sure if this is a problem on the XML-Tools, which I don't believe anymore as the same happend with the XML Copy Editor. Th question is, how to adress elements having namespaces in the XML-file from the XSL file. A simple drawing has the following code:I am new to XSLT and trying to convert a Libre-