Summary
In this chapter, we learned about Namespaces in XML, XML Information Set, and Canonical XML, three specifications that at least at one time were the the work of the W3C XML Core Working Group. All three of these specifications followed the XML 1.0 Recommendation, attempting to address particular areas that are fundamental. The main points covered are:
XML Information Set (Infoset) is an attempt to define a set of terms that other W3C specifications can use to refer to information in a well-formed (but not necessarily valid) XML document that conforms to Namespaces in XML.
Infoset defines eleven kinds of information items, such as element information item and attribute information item, and a different set of properties for each information item type.
It is helpful to understand what is not in the Infoset too, including many details from the DTD.