Embedding custom XML into XMP

[Paul J. Lucas]

If I want to embed my own XML inside XMP, as far as I can tell, I should
do something like this:

<?xpacket begin="" id='W5M0MpCehiH zreSzNTczkc9d'? >
<x:xmpmeta xmlns:x="adobe: ns:meta/">
<rdf:RDF xmlns:rdf="http ://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Descriptio n xmlns:my="http://www.my.com/rdf:about="">
<my:Envelope rdf:parseType=" Literal">
<foo bar="baz">anyth ing I want</foo>
</my:Envelope>
</rdf:Description >
</rdf:RDF>
</x:xmpmeta>
<?xpacket end='w'?>

Yet when I embed such XML inside a TIFF file having tag 700 and open the
TIFF with Photoshop, Photohop complains that the information is wrong (but
doesn't say specifically what) and ignores it.

So how can I embed any XML I want inside an XMP packet?

- Paul

[Paul J. Lucas]

Re: Embedding custom XML into XMP

Paul J. Lucas <pauljlucas.rem ovethis@removet histoo.mac.comw rote:

>
<rdf:Descriptio n xmlns:my="http://www.my.com/rdf:about="">

Yes, I know that should be:

<rdf:Descriptio n xmlns:my="http://www.my.com/" rdf:about="">

The original example was just a bad copy/paste job. The actual XML is
correct.

- Paul

[Andy Dingley]

Re: Embedding custom XML into XMP

On 31 Jan, 16:53, pauljlucas.remo vet...@removeth istoo.mac.com (Paul J.
Lucas) wrote:

So how can I embed any XML I want inside an XMP packet?

I don't think you can. XMP is a very-much subsetted RDF and it doesn't
like anything beyond a simple list of properties, certainly not any
sort of structured graph. As a result I've never really bothered with
it and sadly can't help further. Adobe do have a good specification of
it out on the web though and AFAIR they're quite specific about what
you can and can't do.

[Andy Dingley]

Re: Embedding custom XML into XMP

On 31 Jan, 20:32, pauljlucas.remo vet...@removeth istoo.mac.com (Paul J.
Lucas) wrote:

So how can I embed any XML I want inside an XMP packet?

>

I don't think you can.

Then explain this:

http://www.w3.org/TR/rdf-primer/#xmlliterals

>
The example shows arbitrary XHTML embedded inside the dc:title element.

Lovely. That's RDF not XMP. Like I said, XMP only supports a _subset_
of RDF. That's one of the main reasons why I see XMP as a trivial
irrelevance to anything I work on. If I deal with it, it will only be
as an obsolete minor export format (like RSS 2.0) that I down-convert
into from the real data model.

Read the XMP SDK (download from Adobe)
In particular, p28 of XMPSpecificatio n.pdf

:RDF Issues
:Unsupported Features
:XMP uses a subset of RDF. Valid XMP is limited to the RDF described
in the previous
:sections, along with all equivalent alternate forms of that RDF.
:[...]
:● The rdf:parseType=' Literal' attribute is not supported.

[Grant Robertson]

Re: Embedding custom XML into XMP

In article <1170335972.613 389.193130@a34g 2000cwb.googleg roups.com>,
dingbat@codesmi ths.com says...

Lovely. That's RDF not XMP. Like I said, XMP only supports a _subset_
of RDF. That's one of the main reasons why I see XMP as a trivial
irrelevance to anything I work on. If I deal with it, it will only be
as an obsolete minor export format (like RSS 2.0) that I down-convert
into from the real data model.
>

So, if I were creating a standard, then allowing XMP to be used to
provide information about images would be wise but allowing only XMP and
nothing else would be unwise?