[kepler-dev] web service actor

[Edward A Lee]

Our ultimate objective is to have an XML type that functions
like a record type. The schema could be a representation of the
type... However, this is not a trivial thing... Currently, all
our types are defined by prototypes: That is, the type
{foo=double, bar=string} is actually a record, not just a type,
with value {foo=0.0, bar=""}.  That is "double" and "string"
are constants in the scope of the expression language.
To do the same with XML would require that something like
the XML schema designation evaluate to a valid XML object
of the same type as any other XML that matches the schema.
I'm not sure this is possible... but it seems like an extremely
interesting question...  Another interesting question is what
sort of subtyping (if any) is supported. Can one schema
be a subtype of another?  If we build a clean type system around
schema, this would be a big contribution, I think...

Edward


At 05:07 PM 2/25/2004 -0800, Bertram Ludaescher wrote:


>Chad:
>
>I have some questions regarding the types of data going in and out of
>a web service: In my understanding, web services describe the type of
>their data mostly in XML Schema, and not as Java types.
>
>Since web services can be implemented in different languages, Java,
>C#, PHP, Perl, Python, ... what is the purpose of adding Java types in
>particular?
>
>Wouldn't it be better to use XML Schema types and/or Ptolemy types and
>make them part of the Kepler type system?
>
>We just had a (heated!!) discussion here between Ilkay, Shawn, a local
>web service guru (Jesus) and myself...
>
>Maybe we should have a phone conference on that tomorrow or so...
>
>Bertram
>
> >>>>> "CB" == Chad Berkley <berkley at nceas.ucsb.edu> writes:
>CB>
>CB> Hi Ilkay,
>CB> I was just wondering how your progress is going on getting the web
>CB> service actor to return objects (besides strings).  I now have a bunch
>CB> of web services that make calls to GRASS that I would like to use in
>CB> kepler.  All of these services return the same object
>CB> (GrassReturnObject).  If you want or need some help getting that actor
>CB> to work, I'd be glad to help.
>CB>
>CB> chad
>CB>
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------------
Edward A. Lee, Professor
518 Cory Hall, UC Berkeley, Berkeley, CA 94720
phone: 510-642-0455, fax: 510-642-2739
eal at eecs.Berkeley.EDU, http://ptolemy.eecs.berkeley.edu/~eal