Can it interoperate with other XML languages, e.g. MathML?
Not at the moment, only a subset of the National Library of Medicine Journal Publishing DTD is supported. However, because the semantic structure stored in Lemon8-XML is not tied to any particular schema, it is possible to write output XSL transformations to any XML schema desired. We are planning to include additional XML schemas such as Docbook, Erudit DTD, and TEI, as well as support for embedded MathML, SVG, etc. in the future.