Dear Radu, thank You for Your quick response and Your in depth explanations. It's of great help to know how the "machine" works (plugins, OxygenXML architecture). From the practical part of Your illustrations i learned, that i either have to customize my setup or have to wait for the DITA ...

I'm using oxygenxml-editor. By entering "file --> new file --> "math" (in filter text field)" i got with "Composite with MathML" quickly a starting point for equations in dita. After that i searched for code examples concerning questions like: How to change equation ali...