XMP is a standard XML format for representing metadata about a file or image. It was originally developed by Adobe, and it is now also ISO 16684-1:2012. Because there is a standard, the XMP, for example, that is embedded in a photo taken by a digital camera can be altered or augmented by the photo-editing program that edits the image. Also, for example, the XMP from every image in a PDF file could be included in the XMP that is embedded in the PDF file.

The XMP standard itself is based, in part, on other metadata standards such as Dublin Core and RDF.

Any XMP file that passes the sanity check implemented in AH Formatter may be embedded in the PDF that AH Formatter generates.

A portion of the XMP extracted from a PDF file is shown below, and the following figure shows the same XMP as presented by Acrobat.

<?xpacket begin="" xml:id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
   xmlns:xapMM="http://ns.adobe.com/xap/1.0/mm/">
<xapMM:DocumentID>uuid:4841192B-77AD-0B4B-BD43-8DF3BDE3A5EA</xapMM:DocumentID>
<xapMM:VersionID>1</xapMM:VersionID>
<xapMM:RenditionClass>default</xapMM:RenditionClass>
</rdf:Description>
<rdf:Description rdf:about=""
   xmlns:pdf="http://ns.adobe.com/pdf/1.3/">
   <pdf:Producer>Antenna House PDF Output Library 6.5.1216 (Windows
   (x64))</pdf:Producer>
<pdf:Keywords>"CSS, formatting"</pdf:Keywords>
<pdf:Trapped>False</pdf:Trapped>
</rdf:Description>
<rdf:Description rdf:about=""
   xmlns:xap="http://ns.adobe.com/xap/1.0/">
   <xap:CreatorTool>AH Formatter V6.5 MR3 for Windows (x64) : 6.5.6.31956
   (2018/02/02 12:52JST)</xap:CreatorTool>
<xap:ModifyDate>2018-02-25T16:38:45Z</xap:ModifyDate>
<xap:CreateDate>2018-02-25T16:38:45Z</xap:CreateDate>
</rdf:Description>
…

Figure 13. XMP properties viewed in Acrobat