is this app sufficient to learn how to build an xml model for a blog?

Answer 1

Probably not, as there is no XML course, and more less specific course about your specific blog XML model ( XML is a mark-up meta language, used for designed different other mark-up languages, as SVG, XHtml, or many other less or more specific/proprietary with each their own specifications, rules, keywords, attributes and so on... even if they share common root syntax stuff )

Answer 2

yes and no