I'm a little confused as to what you're trying to accomplish, but it sounds like you have some data in an XML file that you want to apply to multiple (button) elements on an HTML page? If you can, perhaps post a portion of your XML (with the target data showing), and a mock up of the HTML you'd like to have as a result after parsing the XML.

In any case, you can't parse XML with HTML alone; your options are likely PHP or Javascript. Javascript can be turned off, so if the data you're fetching from XML is crucial to your page, you'll be using PHP.