1. Introduction

This document specifies an abstract data set called the XML information set (Infoset), a description of the information available in a well-formed XML document [XML].

Although technically well-formed XML 1.0, documents that do not conform to [Namespaces] are not considered to have meaningful information sets. This essentially bars documents that have element or attribute names containing colons that are used in other ways than as prescribed by [Namespaces]. There is no requirement for a XML document to be valid in order to have an information set.

An XML document's information set consists of two or more information items (the information set for any well-formed XML document will contain at least the document information item ...

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