Working with metadata

PDF documents contain metadata (information about the document) in an XML format called Extensible Metadata Platform (XMP). PDF metadata includes properties such as the title, author, and date created.

When assembling documents, the result document contains the metadata from the base source document.

Example: Using metadata from the base document

<PDF result="doc3.pdf">

	<PDF source="doc1.pdf"/>

	<PDF source="doc2.pdf"/>

</PDF>

The metadata in doc1.pdf becomes the metadata for the result document doc3.pdf. However, you can modify the document metadata in several ways.

You can use DDX to export the metadata from a PDF document, as in the following example.

Example: Exporting metadata

<Metadata result="doc1.xmp"

	<PDF source="doc1.pdf"/>

</Metadata>

Saved metadata can be imported into a PDF document to replace the existing metadata, as in this example:

Example: Importing saved metadata

<PDF result="doc4.pdf">

	<Metadata source="doc1.xmp"/>

	<PDF source="doc2.pdf"/>

	<PDF source="doc3.pdf"/>

</PDF>

The metadata that was previously exported as doc1.xmp replaces any metadata that existed in doc2.pdf (the base document) and becomes the metadata for doc4.pdf.

Alternatively, you can combine the previous examples without having the XMP returned as a stream by specifying the return attribute:

Example: Using a temporary metadata result

<Metadata result="temp" return="false"

	<PDF source="doc1.pdf"/>

</Metadata>

<PDF result="doc4.pdf">

	<Metadata source="temp"/>

	<PDF source="doc2.pdf"/>

	<PDF source="doc3.pdf"/>

</PDF>

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