[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: RE: Caution using XML Schema backward- or forward-compatib
> So this supports my hunch that what we all need for a > further technological step is to start adding the semantics, > via say RDF, etc, to the basic WSDL and XSD of web services. I think that for a client to be able to utilize a web service, the web service must specify three things: (1) Syntax of the data that the web service makes available to clients; use a grammar-based language such as XML Schemas, or RELAX NG, or DTD. (2) Relationship constraints (e.g. co-constraints) on the data; use Schematron. (3) Semantics of the data; use a data dictionary, or English prose, or RDF/S, or OWL, some combination thereof. I believe that today's WSDLs only address (1). /Roger -----Original Message----- From: Stephen Green [mailto:stephengreenubl@g...] Sent: Saturday, December 29, 2007 6:32 PM To: Fraser Goffin Cc: Costello, Roger L.; xml-dev@l... Subject: Re: RE: Caution using XML Schema backward- or forward-compatibility as a versioning strategy for data exchange On 29/12/2007, Fraser Goffin <goffinf@g...> wrote: > ... Is > it really the case that we will have callers of a business service who > DON'T have a clear understanding of it's purpose (semantics) ? ... and > if the semantics aren't conveyed in the technical artefacts > (WSDL/XSD), can we really have 'unknown' callers (h'mmm not sure) ?? > So this supports my hunch that what we all need for a further technological step is to start adding the semantics, via say RDF, etc, to the basic WSDL and XSD of web services. This ties the semantics more firmly to the syntax. It then obliges service consumers to 'understand' (both in the human, and hopefully also in the machine processing sense) the semantics when using the syntax. It also will, hopefully, maximize the visibility of both changes to semantics and to syntax/structure. Isn't this a natural extension of the semantic web/Web 3.0 principles and in a very worthwhile direction? More intelligent web services? -- Stephen Green Partner SystML, http://www.systml.co.uk Tel: +44 (0) 117 9541606 http://www.biblegateway.com/passage/?search=matthew+22:37 .. and voice
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