AW: AW: Embedding XMP in FO
Hi Jeremias, We're hoping for any help we can get to bring the redesign effort to a point where we can release again. I'm pretty certain now, that will happen sometime next year, but not before summer. I will see what I can do... thanks for the info anyway. Hm My guess is that you didn't take the right approach. See below for an example of an external FOP extension. It could be, however, that the old code (and maybe even the new) doesn't handle namespace prefixes in attributes well. It works now... well it would have worked before: For testing I fancy-dumped the XMP stream in a separate file. Fancy dump but incomplete dump :-)... Stupid mistake. Bye, Victor
AW: Embedding XMP in FO
Hi,
3) Leaf text nodes are not submitted to
FObj.addCharacters(...).
hupps, that's not exactly true :-). addCharaters(...) *is* called and the
text node is appended to the appropriate element, but when dumping the
complete DOM this text node is missing.
Here is the XMP:
x:xmpmeta x:xmptk=XMP toolkit 2.9-9, framework 1.6
xmlns:x=adobe:ns:meta/
rdf:RDF xmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns#;
rdf:Description rdf:about=dieses-dokument
xmlns:xap=http://ns.adobe.com/xap/1.0/;
xap:CreatorTool
Vendor Application XYZ!-- This text node
it is all about --
/xap:CreatorTool
/rdf:Description
/rdf:RDF
/x:xmpmeta
Here is the code:
~
protected void addCharacters ( char data[], int start, int length ) //
overrides ExtensionObj.addCharaters(...)
{
String str = new String( data, start, length );
Text text = this.document.createTextNode( str );
this.element.appendChild(text); // this works for all elements but for
xap:CreatorTool
}
After dumping the DOM:
~~
x:xmpmeta x:xmptk=XMP toolkit 2.9-9, framework 1.6
xmlns:x=adobe:ns:meta/
rdf:RDF xmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns#;
rdf:Description rdf:about=dieses-dokument
xmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns#;
xap:CreatorTool
xmlns:xap=http://ns.adobe.com/xap/1.0// !--
missing text node --
/rdf:Description
/rdf:RDF
/x:xmpmeta
Any ideas?
Thanks,
Victor
AW: Embedding XMP in FO
Hi Jeremias, you haven't told us what branch you are on. Are you on the maintenance branch or on FOP HEAD? I suppose I'm working with the 0.20.5 code base... These hints are targeted at FOP HEAD code but some can be applied to the maintenance branch, too, although the whole mechanism is quite different there. I didn't had the chance to look at the HEAD branch yet. Is it in an stable/usable state? One thing you will have to do is creating an ElementMapping class (plus node subclasses, or you extend the existing ExtensionElementMapping) so the FOTreeBuilder can create nodes for each XML element of the various namespaces in the metadata part. A good example in your case is the bookmarks support code you can find in the org.apache.fop.fo.extensions package. There you have an example of an ElementMapping class (ExtensionElementMapping) and node classes (Bookmarks/Outline). That's the first step. I tried to build up a separated DOM with the XMP data in it (similarly to the SVG stuff). But I think there are several restrictions so that I doubt that this could be done with the 0.20.5 sources. Examples: 1) There is no way to define an own PropertyHandler. There are two for FO and SVG, but they are in the fop.jar as class files. 2) The SAX parser does not submit the prefix bindings for namespaces (e.g. xmlns:xap=http://ns.adobe.com...;) as attributes. They are missing in the PropertyList. 3) Leaf text nodes are not submitted to FObj.addCharacters(...). I'm not sure if attaching the metadata to a page-sequence is the right approach. The page-sequence itself isn't represented in the resulting PDF. You might also have multiple page-sequences in a document. So you should probably attach it to fo:root where it applies to the whole document. Attaching metadata to individual pages or objects is probably trickier. Yes, you're right. Attaching it to the 'root' and to a 'block' or 'foreign-instream-object' is sounder. This should give you a few pointers into the code. I'm not sure if I got everything right, because I'm not so familiar with this part, yet. Hopefully, my colleagues will correct me if I wrote anything wrong. Thanks, it helped me out. But I don't think that the 0.20.5 sources will get me any further... Btw: Did you notice that it does not compile if you remove the fop.jar with compiled sources from the classpath? There seem to be inconsistent packages between the fop.jar and the actual source directory tree. I hope this helps nonetheless. We're looking forward to your patches for FOP HEAD. ;) Well, we'll see :-). One request: Please do not see SVG as the *only* foreign XML vocabulary that one could embed in FO :-). Thank you, Victor
Embedding XMP in FO
Hi Fop developers, I'm using FOP to produce PDFs and I'm trying to embed XMP (a set of XML metadata-describing vocabularies from Adobe) in FO. These XMP packets should be serialized (nearly) one-to-one in a PDF tag for metadata. Here is an simple example: fo:page-sequence master-reference=default-page x:xmpmeta xmlns:x=adobe:ns:meta/ x:xmptk=XMP toolkit 2.9-9, framework 1.6 rdf:RDF xmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns; rdf:Description rdf:about=autodoc:tiff:c:/sample_path/sample.tiff xmlns:xmpMM=http://ns.adobe.com/xap/1.0/mm/; xmpMM:DocumentIDuuid:foo:id-0815/xmpMM:DocumentID /rdf:Description /rdf:RDF /x:xmpmeta fo:flow flow-name=xsl-region-body [...] /fo:page-sequence This XMP metadata says that the generated PDF page sequence is made of the sample.tiff. Serialized to PDF it should look something like: (the best would be only for the first page of the TIFF page sequence) 7 0 obj /Type /Metadata /Subtype /XML /Length 541 stream ?xpacket begin= id=W5M0MpCehiHzreSzNTczkc9d?x:xmpmeta xmlns:x=adobe:ns:meta/ x:xmptk=XMP toolkit 2.9-9, framework 1.6rdf:RDF xmlns:rdf=http://www.w3.org/1999/02/22-rdf-syntax-ns;rdf:Description rdf:about=autodoc:tiff:c:/sample_path/sample.tiff xmlns:xmpMM=http://ns.adobe.com/xap/1.0/mm/;xmpMM:DocumentIDuuid:foo:id- 0815/xmpMM:DocumentID/rdf:Description/rdf:RDF/x:xmpmeta?xpacket end=w? endstream endobj Now my challenge: How can I do this as simple as possible. I tried to extend the FOP sources but permanently get lost, while searching how the FObjs of the FOTree get ready for the List of PDF objects to be rendered. The problem is not the knowledge about XSL-FO nor PDF. I just don't have a view through the FOP sources. With which things do I have to start to embed the so-called foreign XML? I tried XMLObj but only got an [ERROR] null. Thanks in advance for your responce! Bye, Victor
