Re: a or b or both - mystery..
Thinking a little bit more -- I think we all have been taught systems which are closed, with or without our realization. I think closure to me implies that an operation is defined -- i am seriously yet to see union of XML Schemas defined anywhere. Also closure implies the tightest possible output schema, tightness is desirable if you can get it easily -- I think that is what regular tree languages provide. But these are things to be discussed with experts. I did try to bring up slightly this issue with the XML Schema WG sometime in Dec '00 -- I think they might very well be aware of these issues. <warning>speaking for himself only</warning> regards - murali. On Tue, 17 Apr 2001, Murali Mani wrote: > > I read Joe English's mail also. > Let me ask you -- is there a definition of union of XML Schemas. I want to > take union of 2 XML schemas, show me a way of doing it. > > For every operation, we should define how we can obtain the output type -- > this is not needed unless your processing uses Schema. > > I am slightly sceptical that we will be able to define any meaningful > union or other operations for XML Schemas. > > <warning>speaking for himself only</warning> > > cheers - murali. > > On Tue, 17 Apr 2001, Marcus Carr wrote: > > > > > Murali Mani wrote: > > > > > I have asked professors and others -- everyone I have asked believes > > > things just will not work without closure - you will get unexpected > > > things. > > > > What things will not work and what unexpected things might you get? > > > > > I think if you use XML only for data exchange, then closure does > > > not matter, but if you want to do actual processing, then I think closure > > > is *very* important. > > > > What sort of processing? I have been involved with (perhaps a different form of?) SGML > > and XML processing for ten years and I don't really even understand the problem...:-) > > > > > And it was a pleasure trying to explain whatever I know. I think everyone > > > in this group tries to learn from the other. > > > > Absolutely - what you know still seems to be whizzing by me a bit, but I appreciate > > your taking the time. > > > > > > -- > > Regards, > > > > Marcus Carr email: mrc@a... > > ___________________________________________________________________ > > Allette Systems (Australia) www: http://www.allette.com.au > > ___________________________________________________________________ > > "Everything should be made as simple as possible, but not simpler." > > - Einstein > > > > > > > > > > ------------------------------------------------------------------ > The xml-dev list is sponsored by XML.org, an initiative of OASIS > <http://www.oasis-open.org> > > The list archives are at http://lists.xml.org/archives/xml-dev/ > > To unsubscribe from this elist send a message with the single word > "unsubscribe" in the body to: xml-dev-request@l... >
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