I think of XML infosets as abstract representations of a well-formed XML document. They add precision in thinking about XML processing removing assumptions made about certain parsers or interfaces. On a practical level XML Infosets require the support of XML namespaces which the core XML recommendation does not. Namespaces are required to support XML schema. XML Infoset also imply the XML having been processed to resolve any entity references.
Of course, synthetic infosets can be created which have nothing to do with a parser. Section 2.6 of the XML Infoset recommendation says that each character information iterm have three properties, one of which is element content white space boolean, solving the "hello world" example.
check it out here:
XML Infoset Recommendation
Good stuff!
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