TMQL slides Prague 2011

Robert Barta <[email protected]>
Newsgroups gmane.text.xml.xtm.general
Message-ID <[email protected]>
Rani,

The slides at

   tmql-meeting isa iso-meeting @ "Prague" in 2011
     slides : http://www.itscj.ipsj.or.jp/sc34/open/1586.pdf

say at Page 39:

   t1 isa t2 .

and then that all instances of t1 are also instances of t2.

I find that a bit ... aggressive. On what semantics is this based?

\rho
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