You can use JavaScript to extract the custom XMP with the "doc.metadata" property. However, doing something with it outside of Acrobat is a problem. Acrobat JavaScript is sandboxed, so you have limited options when it comes to exporting the XMP data.
Adobe provides an SDK for XMP and there are several 3rd party tools for XMP handling. Do a google search on "XMP metadata tools"
Adobe provides an SDK for XMP and there are several 3rd party tools for XMP handling. Do a google search on "XMP metadata tools"
Thom Parker
The source for PDF Scripting Info
www.pdfscripting.com
Very Important - How to Debug Your Script