The Extensible Metadata Platform or XMP is a specific type of extensible markup language used in PDF, photography and photo editing applications. It was first introduced by Adobe Systems in April 2001 as part of version 5.0 of the Adobe Acrobat software product.
XMP defines a metadata model that can be used with any defined set of metadata items. XMP also defines particular schemas for basic properties useful for recording the history of a resource as it passes through multiple processing steps, from being photographed, scanned, or authored as text, through photo editing steps (such as cropping or color adjustment), to assembly into a final image. XMP allows each software program or device along the way to add its own information to a digital resource, which can then be retained in the final digital file.
XMP records metadata in a syntax that forms a subset of the World Wide Web Consortium Resource Description Framework, which is in turn expressed in XML.
