Employs various techniques to identify the author
Dublin Core provides the dc:creator, dc:contributor, and dc:publisher elements for defining authorship in RSS1. We will try each of those in turn in order to simulate the atom author element and will return it as text.
Allows retrieval of an entry by ID where the rdf:about attribute is used
This is not really something that will work with RSS1 as it does not have clear restrictions on the global uniqueness of IDs. We will employ the _very_ hit and miss method of selecting entries based on the rdf:about attribute. If DOMXPath::evaluate is available, we also use that to store a reference to the entry in the array used by getEntryByOffset so that method does not have to seek out the entry if it's requested that way.
Parameters: