Mailing the story:
XMP making inroads in open source imaging software
Two separate projects are attempting to build support for the Extensible Metadata Platform (XMP) in Linux. Not to be confused with the "Jabber protocol" XMPP, XMP is an XML-based metadata standard for digital images. Despite its historical connections to photography, other kinds of applications and data stand to benefit, too, making XMP-aware projects something we all should watch.