About base documents

When assembling multiple PDF source documents, one of them is considered to be the base document. The base document is used as the source of certain properties of the result document, including document properties, form data, document-level JavaScript code, and viewer preferences. Other source documents do not contribute these properties to the result, but they do contribute the other PDF building blocks such as page content and properties (see DDX building blocks) to the result document.

The base document is determined by attributes of the PDF source elements that are children of the PDF result, as follows:

•	Any PDF source element containing a baseDocument attribute whose value is true is the base document. The default value of baseDocument is false, and it is an error for more than one source element in a PDF result block to have baseDocument set to true.

•	Otherwise, the first PDF source element, if any, whose source attribute has the same value as the PDF result element’s result attribute is the base document.

•	Otherwise, the first PDF source element in the PDF result block is the base document.

The following example illustrates these cases.

Example: Setting the base document

<PDF result="doc3">

	<PDF source="doc1"/>

	<PDF source="doc2" baseDocument="true"/> 		<!--base document (explicit)-->

</PDF>

<PDF result="doc2">

	<PDF source="doc1"/>

	<PDF source="doc2"/> 		<!--base document (source matches result)-->

</PDF>

<PDF result="doc3">

	<PDF source="doc1"/>		 <!--base document (first source document)-->

	<PDF source="doc2"/> 

</PDF>

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