description: An optional extension handler for items like comments that are not part of the information set and may be omitted.
description: An optional extension handler for ATTLIST and ELEMENT declarations (but not notations and unparsed entities).
description: When parsing, the current DOM node being visited if this is a DOM iterator; when not parsing, the root DOM node for iteration.
access: (parsing) read-only; (not parsing) read/write
description: The literal string of characters that was the source for the current event.
adapted from SAX2 documentation by David Megginson