4. Conformance
An XML processor conforms to the XML Information Set if it provides all the core information items and all their core properties corresponding to that part of the document that the processor has actually read. For instance, attributes are core information items; therefore, an XML processor that does not report the existence of attributes, as well as their names and values (which are core properties of attributes), does not conform to the XML Information Set.
Some information items are peripheral, and some core information items have peripheral information associated with them. If an XML processor reports an information item, then it must supply at least the core properties defined by the XML Information Set in order to conform. ...
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