The XML Infoset:
Just because an XML document is an infoset does not mean it conforms to an XSD and is a valid XML document.
An XML document's information set consists of a number of information items.
The information set for any well-formed XML document will contain at least a document information item and several others.
An information set can contain up to eleven different types of information items:
There are information items representing:
XML is just one way of representing that data.
The infoset may exist:
For example, the infoset does not distinguish between the two forms of empty element.
The following are considered equivalent according to the XML Infoset.
<test></test>
<test/>
Infoset augmentation or infoset modification refers to the process of modifying the infoset during schema validation, for example by adding default attributes.