PDF 2.0 Application Note 003: Clarification on locations for object metadata streams
Boris Doubrov Dietrich von Seggern
<p>This application note summarizes precisely where PDF creators should add XMP metadata to PDF 2.0 objects, and thus where PDF 2.0 processors should search for it.</p>

<p>In most cases metadata is all about interoperability; it is only useful if creator and processor agree on syntax and semantics. In the context of PDF this also means that creator and processor must agree on where metadata is present in the often-complex internal PDF structure.</p>

<p>Metadata locations are well defined for XMP metadata on the PDF document level and for some PDF objects, but not for all objects where metadata can occur (pages, page objects and resources such as fonts or ICC profiles). However, in almost all cases sufficient guidance can be derived from the PDF specification, albeit sometimes in an indirect way.</p>

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Digital Preservation PDF