XSLT not working now I added a namespace

I just added a namespace to my XML document and now my XSLT styleshe开发者_JAVA技巧et does not work. What do I have to change in XSLT to support namespaces? (I have not yet changed the XSLT file since adding namespaces)

You have to add a xmlns:namespacehere attribute and use the namespace in the appropriate matches and selections.