This patch will add the xsd schema for drawing/2012/chart and generate the classes.
Created attachment 38500 [details] Addd the drawing/2012/chart xsd and generate the classes
Could you provide a URL for that xsd? Just so we can verify it independently. Why c15 as a prefix?
I got the schema from https://learn.microsoft.com/en-us/openspecs/office_standards/ms-odrawxml/1c52d959-25d3-4556-9381-cc86c1221029 Only line 2 and 3 are modified, so it used the 2006 xsd files that are present in the POI project. The "c15" prefix is coming from Powerpoint. If you save a presentation that something that uses from this extension to the spec, it will prefix it with "c15".
added with r1907789
These classes will not end up in poi-ooxml-lite because no tests use the classes. Users who want to use poi-ooxml-full and code at the level of XMLBeans generated classes may benefit - but coding at this level, is quite trial and error.