[children] - An order list of child info items. There must be exactly one element info item amongst them. There are other constraints too...

[document element] - The element corresponding to the root of the element tree.

[base URI] - The base URI of this document.

[character encoding scheme] - The name of the unicode character encoding scheme used.

[standalone] - The standalone value from the xml declaration.

[version] - The version value from the xml declaration.