[xep-support] alignment-baseline property does not match the spec

[Bob Stayton]

I've been updating the DocBook XSL stylesheets to map the valign 
attribute values for DocBook's inlinemediaobject elements to the correct 
alignment-baseline property values in XSL-FO.  The value of "top" should 
map to alignment-baseline="before-edge" and "bottom" should map to 
alignment-baseline="after-edge". These settings work in FOP 2.1 and in 
Antenna House Formatter, but not in XEP.  When I test with samples 
similar to the XSL 1.1 specification examples, I find the inline images 
overwrite the text lines below with XEP.

I created my test samples for inline images from the illustration on 
page 293 of the PDF version of the XSL 1.1 spec at 
https://www.w3.org/TR/2006/REC-xsl11-20061205/xsl11.pdf.  I then 
processed it with the updated stylesheets and tested the results in the 
three FO processors.

The attached PDF is assembled from pages extracted from three separate 
PDF outputs: FOP, AH, and XEP. You can see the FOP and AH output is 
similar to the specification's illustration, but the third page with the 
XEP output overwrites the lines below with the inline images.

I would be happy to supply my .fo file and images if you want to test 
this yourself.

-- 
Bob Stayton
Sagehill Enterprises
bobs at sagehill.net

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