Can I define new attributes in XMP for PDF? -

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i know there attributes in xmp pdf files such as:

     <xap:modifydate>2009-12-10t09:54:47-05:00</xap:modifydate>      <xap:createdate>2009-12-10t09:42:54-05:00</xap:createdate>      <xap:metadatadate>2009-12-10t09:54:47-05:00</xap:metadatadate>      <xap:creatortool>adobe indesign cs4 (6.0.4)</xap:creatortool>

but want define custom attributes example:

     <xap:viewtitle>2009-12-10t09:54:47-05:00</xap:viewtitle>      <xap:guid>2009-12-10t09:42:54-05:00</xap:guid>

can it?

yes, can.

according xmp specification

new properties may added existing namespaces without “breaking” applications.

the definitions of properties in existing namespaces should remain same; otherwise, applications may produce incorrect behavior. if necessary change meaning of property, new property should created (and old 1 declared deprecated).

and can create new custom schemas. it's better approach extending existing schema.

more information can found in extensibility of schemas in xmp specification.


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