I've taken a look at this and found that the problem is an empty fo:inline element with an id attribute. In the DocBook 5 example, substituting the anchor element with a phrase element (keeping the element empty) causes the same problem, since the DocBook XSL-NS stylesheets translate this to the same thing. The error does not occur if there is content as a child of the element. Note, however, that anchor is defined as empty, so this does break the use of anchor.
I'll take a quick look and see if I can provide a patch. -- brian m. carlson / brian with sandals: Houston, Texas, US +1 713 440 7475 | http://crustytoothpaste.ath.cx/~bmc | My opinion only OpenPGP: RSA v4 4096b 88AC E9B2 9196 305B A994 7552 F1BA 225C 0223 B187
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