[Libreoffice] export mathml

[Александр Лаврущенко]

Thanks again, i got it

properties = (OOoLib.makePropertyValue(
        'FilterName',
        'MathML XML (Math)'
    ),)
oObj.EmbeddedObject.storeToURL(url,properties)

do exactly what i need. Well almost exactly.

I see thre are available storeToStorage method, what its purpose,
where i can see its docs/semantics?

I mean saving to file not so bad, but i prefer to save it in memory,
because in general its not very nice to deal with heap of temp files i
think.