I do agree that the examples of <ptr> have the potential to confuse, as they mix born-digital encoding
with transcription encoding. Leaving that aside, though, the processor which wants to handle arbitrary
TEI XML texts does not have _that_ hard a task to decide how to handle <ptr>. You basically follow the link
and ask the object you arrive at what its title is. so
* a web site may return its URL or a head/title element from its HTML
* a div/list/table in TEI may return its <head>
* a <biblStruct> may return "Author, Year" or  depending on desired style
* any of them may return their page number, if you are in print mode.
But these "rules" are not written down by the TEI. One of us could propose such a rule
set for adoption, an algorithm we can all implement, and that would be nice.
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que el futuro no me sea indiferente