[Xmlgraphics Wiki] Update of "ExtensibleMetadataPlatform" by JeremiasMaerki

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The following page has been changed by JeremiasMaerki:
http://wiki.apache.org/xmlgraphics/ExtensibleMetadataPlatform

The comment on the change is:
Some notes on XMP

New page:
This page contains notes about a framework for handling XMP metadata.

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== Goal ==

In order to satisfy the PDF/A-1 specification Apache FOP needs a small XMP metadata framework. A generalized framework for XMP could be used inside the whole XML Graphics project and in other projects such as [http://www.pdfbox.org PDFBox].

== Existing Efforts ==

So far, there are no major open source XMP toolkits in Java around. [http://www.lowagie.com/iText/ iText] has some code and Ben Litchfield's [http://sourceforge.net/projects/jempbox JempBox] is another effort. Ben offered to work with us on this.

== Requirements ==

=== Mandatory ===

 * compatible with JDK 1.3 and higher
 * parsing XMP (both from a SAX stream as well as XMP packets loaded from arbitrary files)
 * writing XMP (both as XMP snippets and XMP packets)
 * a suitable in-memory representation of XMP
 * user-friendly read/write access to XMP values through XMP schemas
 * Merging of two XMP documents
   * Use case: The main XMP document is contained in an XSL-FO file but the user agent (FOP) has additional values that need to be merged in (FOP's values overriding the ones from the FO file).

=== Optional/Future ===

 * extension schema support as required by PDF/A-1
 * validation

== Links ==

 * [http://mail-archives.apache.org/mod_mbox/xmlgraphics-general/200605.mbox/%3c20060519140259.6C13.DEV@jeremias-maerki.ch%3e The initial mail on general.at.xmlgraphics.apache.org]
 * [http://www.adobe.com/products/xmp/index.html Adobe's XMP website]
 * [http://partners.adobe.com/public/developer/xmp/sdk/index.html XMP specification]

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