Re: errors during fo:external-graphic processing

Stefan Seefeld <[email protected]> writes:
> Here are some more observations when processing fo:external-graphic
> elements:
>
> 1) The 'src' attribute is an url, meaning it has to be resolved
>    relative to the url base of the current node it was found in.
>    However, xmlroff tries to read it as a file, i.e. relative to
>    the current working directory (for example in fo-image.c:236).
>    Shouldn't something like xmlBuildURI() be used to actually
>    construct the correct absolute filename ?

Your observations are correct.

I have been wondering what to do about that, and about xml:base attributes,
and about http URIs.  I will look into xmlBuildURI().

>
> 2) I now get this error:
>
>
> (process:7561): libfo-CRITICAL **: Expression evaluation error: Expression not completely evaluated: 
> ':image/svg+xml'
> Object path: 
> /FoTree[1]/root[1]/page-sequence[3]/flow[1]/FoBlockBlock[3]/FoBlockLayout[1]/external-graphic[1]
>
> (process:7561): libfo-WARNING **: Unsupported property: (null)
>
> My external-graphic element contains an attribute:
>
> content-type="content-type:image/svg+xml"
>
> and it seems as if xmlroff doesn't understand that. What is
> not clear to me is whether it doesn't understand the 'image/svg+xml'
> type, or whether it doesn't understand the 'content-type' format at all.

Section 5.9 of the XSL 1.0 specification says:

   All property value expressions in attributes within an XSL stylesheet can
   be expressions.

except that patently some of them can't be.

content-type will need yet another special expression parser, and should be
added to libfo-compat.xsl until that happens.

> 3) When I remove that attribute alltogether xmlroff will
>    seemingly run forever (well, at least I had to kill it
>    after a long while). I didn't have a close look into
>    the call stack to find out what it was doing then, though.

Sorry, no quick answer for that one since I haven't seen it before.

I doubt that it relates specifically to removing the attribute since the
attribute currently isn't used.

Regards,


Tony.



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