Fetch data inside <mc:Choice Requires="wps"> (docx4j) - docx4j

Question

This is a typical structure of a <w:r> which contains shape(s).
<w:r w:rsidR="00D10BFA">
<w:rPr>
<w:noProof/>
<w:lang w:eastAsia="en-PH" />
</w:rPr>
<mc:AlternateContent>
<mc:Choice Requires="wps">
<w:drawing>
<wp:anchor distT="0" distB="0" distL="114300" distR="114300" simplePos="0" relativeHeight="251660288" behindDoc="0" locked="0" layoutInCell="1" allowOverlap="1">
<wp:simplePos x="0" y="0" />
<wp:positionH relativeFrom="column">
<wp:posOffset>2171700</wp:posOffset>
</wp:positionH>
<wp:positionV relativeFrom="paragraph">
<wp:posOffset>99203</wp:posOffset>
</wp:positionV>
<wp:extent cx="1943100" cy="1714500" />
<wp:effectExtent l="19050" t="19050" r="19050" b="19050" />
<wp:wrapNone/>
<wp:docPr id="2" name="Oval 2" />
<wp:cNvGraphicFramePr/>
<a:graphic xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main">
<a:graphicData uri="http://schemas.microsoft.com/office/word/2010/wordprocessingShape">
<wps:wsp>
<wps:cNvSpPr/>
<wps:spPr>
<a:xfrm>
<a:off x="0" y="0" />
<a:ext cx="1943100" cy="1714500" />
</a:xfrm>
<a:prstGeom prst="ellipse">
<a:avLst/>
</a:prstGeom>
<a:solidFill>
<a:schemeClr val="accent4">
<a:lumMod val="75000" />
</a:schemeClr>
</a:solidFill>
<a:ln w="28575" cap="sq">
<a:solidFill>
<a:schemeClr val="accent6">
<a:lumMod val="75000" />
</a:schemeClr>
</a:solidFill>
</a:ln>
</wps:spPr>
<wps:style>
<a:lnRef idx="2">
<a:schemeClr val="accent1">
<a:shade val="50000" />
</a:schemeClr>
</a:lnRef>
<a:fillRef idx="1">
<a:schemeClr val="accent1" />
</a:fillRef>
<a:effectRef idx="0">
<a:schemeClr val="accent1" />
</a:effectRef>
<a:fontRef idx="minor">
<a:schemeClr val="lt1" />
</a:fontRef>
</wps:style>
<wps:txbx>
<w:txbxContent>
<w:p w:rsidR="00D10BFA" w:rsidRDefault="00D10BFA" w:rsidP="00D10BFA">
<w:pPr>
<w:jc w:val="center" />
</w:pPr>
<w:r>
<w:t>THEQUICKBROWNFOXJUMPSOVERTHELAZYDOG.THEQUICKBROWNFOXJUMPSOVERTHELAZYDOG.THEQUICKBROWFA</w:t>
</w:r>
</w:p>
</w:txbxContent>
</wps:txbx>
<wps:bodyPr rot="0" spcFirstLastPara="0" vertOverflow="overflow" horzOverflow="overflow" vert="horz" wrap="square" lIns="91440" tIns="45720" rIns="91440" bIns="45720" numCol="1" spcCol="0" rtlCol="0" fromWordArt="0" anchor="ctr" anchorCtr="0" forceAA="0" compatLnSpc="1">
<a:prstTxWarp prst="textNoShape">
<a:avLst/>
</a:prstTxWarp>
<a:noAutofit/>
</wps:bodyPr>
</wps:wsp>
</a:graphicData>
</a:graphic>
</wp:anchor>
</w:drawing>
</mc:Choice>
<mc:Fallback>
<w:pict>
<v:oval id="Oval 2" o:spid="_x0000_s1028" style="position:absolute;margin-left:171pt;margin-top:7.8pt;width:153pt;height:135pt;z-index:251660288;visibility:visible;mso-wrap-style:square;mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;mso-wrap-distance-bottom:0;mso-position-horizontal:absolute;mso-position-horizontal-relative:text;mso-position-vertical:absolute;mso-position-vertical-relative:text;v-text-anchor:middle" o:gfxdata="UEsDBBQABgAIAAAAIQC2gziS/gAAAOEBAAATAAAAW0NvbnRlbnRfVHlwZXNdLnhtbJSRQU7DMBBF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" fillcolor="#bf8f00 [2407]" strokecolor="#538135 [2409]" strokeweight="2.25pt">
<v:stroke joinstyle="miter" endcap="square" />
<v:textbox>
<w:txbxContent>
<w:p w:rsidR="00D10BFA" w:rsidRDefault="00D10BFA" w:rsidP="00D10BFA">
<w:pPr>
<w:jc w:val="center" />
</w:pPr>
<w:r>
<w:t>THEQUICKBROWNFOXJUMPSOVERTHELAZYDOG.THEQUICKBROWNFOXJUMPSOVERTHELAZYDOG.THEQUICKBROWFA</w:t>
</w:r>
</w:p>
</w:txbxContent>
</v:textbox>
</v:oval>
</w:pict>
</mc:Fallback>
</mc:AlternateContent>
It contains rPr and mc:AlternateContent. My problem here is that when I try to do r.getContent(), you would expect to have two elements rPr and mc:AlternateContent. But in actual result, you would only have pict, since the behavior goes like: r.getContent() only fetches elements inside the <mc:Fallback> tag.
What I want to have is, I want to retrieve <a:graphic> which is definitely inside <mc:Choice>.<w:drawing>.<wp:anchor>.

Answer 1

In general, the presence of an mc element causes an UnmarshalException, since it is invalid content according to the schemas used in docx4j.
When that happens, docx4j pre-processes the content through org/docx4j/jaxb/mc-preprocessor.xslt which usually selects the mc:Fallback content.
You have various options to override this behaviour:
easy: you can supply your own xslt, which does something different; see the property "docx4j.jaxb.JaxbValidationEventHandler" to point to its location
more complex and completely unsupported: alter the XSDs to allow mc namespace content in the element of interest, then regenerate the relevant classes using xsd
modify a jaxb implementation itself, to cope with how the markup compatibility mechanism works. This would be very cool!
For more, Google 'office openxml markup compatibility and extensibility' or try this TC45 final draft.