This schema specifies XMP properties used with Adobe PDF documents.

• Exiv2 keys are Xmp.pdf.<Property>
• The schema namespace URI is http://ns.adobe.com/pdf/1.3/
• The preferred schema namespace prefix is pdf

Reference: XMP Specification and Documentation

Property	Label	Value type	Exiv2 type	Category	Description
Keywords	Keywords	Text	XmpText	External	Keywords.
PDFVersion	PDF Version	Text	XmpText	Internal	The PDF file version (for example: 1.0, 1.3, and so on).
Producer	Producer	AgentName	XmpText	Internal	The name of the tool that created the PDF document.
Trapped	Trapped	Boolean	XmpText	External	True when the document has been trapped.