Element relationships and roles

A number of DDX elements have syntax that varies depending on the context in which they are used. These elements are identified using the following terminology:

•	A result element represents data being created. Result elements include a result attribute (with the exception of the PDFsFromBookmarks element, which has a prefix attribute instead).

Result elements have no initial content but accumulate the content of their child elements. Examples of result elements are the PDF result element and the FileAttachments result element.

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A source element represents content to contribute to the result. It must be a child of a result element and must have a source attribute (with the exception of the PDF source and PackageFile elements, which can alternatively have a sourceMatch attribute). Examples of source elements are the PDF source element and the FileAttachments source element.

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A filter element is like a result element in that it takes its content from source elements nested within it, and it is like a source element in that it must be a child of a result element. Filter elements have neither a result nor a source attribute but contain child elements of a certain type. Examples of filter elements are the Comment filter element and the Links filter element.

When using DDX, it is important to understand the meaning of relationships between elements (such as parent, child and sibling), the scope of elements, and the inheritance of attributes.

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