The context to be used to help define the structure of the document

A unique id for this structure info. This id is generated automatically by the implementation, and cannot be changed.

True if the display name provided by the context is the one that must always be used when displaying the context in a structural tree, etc. This is usually the case if a context does not have any other text associated with it, for example, an image or a table. If this is false, the client application can try and display some more useful information to the user, for example, the corresponding text in a paragraph context.

The structural info of which this context is a child