XML - Extensible Markup Language - and related, XSLT, XSLFO, XLink, XQuery,XPath, XSD/Schema, Schematron, XTest...| use https://pastebin.com for pastes over 3 lines or https://public.etherpad-mozilla.org/ for editing/commenting by others | Don't ask to ask: ask, and then wait a few hours... there is also a Slack server hosted by xml.com