TMQL: Minor issue: Plurals for paths

Hi all,

Comments against: <http://www.itscj.ipsj.or.jp/sc34/open/1586.pdf>

While the usage of plurals may match the TMDM properties, TMQL is the
only path language which uses plural terms and not singular terms for
paths/axes. Further, it breaks to some extent my way of thinking. I'd
translate the path expression


   t/occurrence

into

  t/*[. isa occurrence]


So "t/occurrences" does not match well with the mental model. Further,
the path names can be reduced a bit.

NB: XPath, XQuery and Versa (RDF) use singular terms.

Best regards,
Lars
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