From: Wagner, G.R. (G.R.Wagner@tm.tue.nl)
Date: 05/29/03
> > 3. More Built-ins: > > ---------------- > > 3.1 Assign = > > What does this mean in a KR language, where it doesn't make sense to > talk about changing the value of something? Right! That's why we have to distinguish between derivation rules and production rules, resp. reaction rules. In derivation rules, all the state changing and action built-ins from Said's list do not make sense: 3.1 Assign = 3.2 Increment ++ 3.3 Decrement -- 6.1 open Open a file or a stream 6.2 read Read from stream or file 6.3 write Write to a stream or file 6.4 close close file or stream 6.5 printout sends unformatted output to a given stream/router They only make sense in production rules resp. reaction rules. The same seems to apply to Said's group 7 (control and debugging built-ins), whose relevance to a Web rule language is not clear to me. > > 5. String built-ins: > > ----------------- > > 5.1 str-length returns the length of a given string > > 5.2 str-cat string concatenation > > 5.3 ... For all algebraic operations (not specified by XML Schema) we should refer to another standard (such as UML/OCL) instead of defining our own set of names! -Gerd
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