musicxml2ly: <movement-title> not converted in the presence of a non-empty <work-title>

[Patrick Schmidt]

Hi Reinhold et al.,

this is how musicxml2ly works at the moment:

1) if XML: <work-title>bli></work-title> --> LilyPond: title = bli
2) if XML: <movement-title>bla</movement-title> --> LilyPond: title = bla
3) if XML: <work-title></work-title> (empty) AND 
<movement-title>bla</movement-title> --> LilyPond: title = bla

so far so good, but

4) if XML: <work-title>bli</work-title> (non-empty!) AND 
<movement-title>bla</movement-title> --> LilyPond: title = bli

So any information in a <movement-title>-element is lost in the conversion with 
musicxml2ly when the .xml-file also contains a non-empty <work-title>-element. 
I tried to change the code in order to reach something like the following (but 
never managed to meet all 4 demands):

if XML: <work-title>bli</work-title> (non-empty!) AND 
<movement-title>bla</movement-title> --> LilyPond: title = bli; subtitle = bla

How can I say this in python?

Thanks for any hint!
patrick

WorkTitle-MovementTitle.xml
Description: application/xml