Is there a way to insert a external url (xml) in to the page content
I don’t think so, although you probably could write a simple plugin to do it. Something along the lines of this: https://github.com/getgrav/grav-plugin-page-inject
Is there a way to insert a external url (xml) in to the page content
I don’t think so, although you probably could write a simple plugin to do it. Something along the lines of this: https://github.com/getgrav/grav-plugin-page-inject