[gs-devel] How to generate GUID/UUID in Ghostscript ?

[Leonardo]

Developers,

Since PDF/A requires XMP Metadata to be included into output,
and since XMP includes an instance ID as a GUID/UUID-style ID,
I'd like to collect opinions how will we generate GUID/UUID in
the pdfwrite device or in the graphics library.

Popular methods are based on a high resolution timer and
a physical network address. Currently they both are not accessible through
the Ghostscript platform interface. So please suggest how the latter to be 
extended.

Leo.