The XML information set, also called the XML Infoset, is a specification for an abstract model of an Extensible Markup Language (XML) document. The specification contains a consistent set of definitions for use in other specifications relevant to the data in XML documents.
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The World Wide Web Consortium (W3C) adopted the Second Edition of the XML Infoset recommendation in February of 2004.
The specification describes the data model for an XML document as a set of information items. According to the Second Edition recommendation, the XML Infoset can contain the following information items:
- elements within documents
- attributes of documents
- document processing instructions
- unexpanded entity references
- Document Type Definitions (DTDs)
- unparsed entities