I figured this out. Turned out that my xml was using a different namespace? I had to follow guidance I found on stackoverflow: https://stackoverflow.com/questions/5239685/xml-namespace-breaking-my-xpath
So my play now looks like this (and works): tasks: - name: Test modifying XML win_xml: path: e:\jboss-eap-6.4\XXXXXXXXX\configuration\domain.xml xpath: '/*[local-name()="domain"]/*[local-name()="server-groups"]/*[local-name()="server-group"]/*[local-name()="jvm"]/*[local-name()="heap"]' attribute: 'size' fragment: '123m' type: attribute -- You received this message because you are subscribed to the Google Groups "Ansible Project" group. To unsubscribe from this group and stop receiving emails from it, send an email to ansible-project+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/4c0d8605-8923-4346-bb06-e252c1a18142%40googlegroups.com.