The other hand of XML files and WebSQL

Why not load the XML form data store into an XML object and just apply standard XSL transformations. XSL style sheets are not all that complicated.

My target user is hobbyist database managers, people using WebSQL to manage XML documents. I concluded that XSL is something they should to learn if the alternatives are deeply constructed SQL queries. Right decision, I think.

So when they pull an XML tree from WebSQL, then they should associate that tree with an XSL transformation. They can keep the transformations in separate files or declare them right in their document. Since the XSL sequences are XML trees themselves, they can be stored right in the WebSql along with the data.