Re: system.getCapabilities

--- In xml-rpc <at> yahoogroups.com, Andreas Bolka <andreas.bolka <at> ...> wrote:
>
> Hi all!
> 
> As I just noticed, no one has yet posted the struct approach, for
> beeing able to look up wether a implementation supports a given
> capability - as Charles and me have already textually described it,
> I'll first try to formalise this ;) Afterwards some more thoughts.
> 
> so here's a RFC:
> 
> struct system.getCapabilities()
> 
> retval:
>  struct {
>      "specId1" => struct {
>          "specUrl" => string,
>          "specVersion" => integer
>      }
>      "specId2" => struct {
>          "specUrl" => string,
>          "specVersion" => integer
>      }
>      ...
>  }
> 
> in XML (example):
> 
> <struct>
>         <member>
>                 <name>xmlrpc</name>
>                 <value>
>                        <struct>
>                                <member>
>                                        <name>specUrl</name>
>                                        <value><string>http://www.xmlrpc.com/spec</string></value>
>                                        </member>
>                                <member>
>                                        <name>specVersion</name>
>                                        <value><int>1</int></value>
>                                        </member>
>                                </struct>
>                        </value>
>                 </member>
>         <member>
>                 <name>introspect</name>
>                 <value>
>                        <struct>
>                                <member>
>                                        <name>specUrl</name>
>                                        <value><string>http://xmlrpc.usefulinc.com/doc/reserved.html</string></value>
>                                        </member>
>                                <member>
>                                        <name>specVersion</name>
>                                        <value><int>1</int></value>
>                                        </member>
>                                </struct>
>                        </value>
>                 </member>
>         <member>
>                 <name>faultCodes</name>
>                 <value>
>                        <struct>
>                                <member>
>                                        <name>specUrl</name>
>                                        <value><string>http://xmlrpc-epi.sourceforge.net/specs/rfc.fault_codes.php</string></value>
>                                        </member>
>                                <member>
>                                        <name>specVersion</name>
>                                        <value><int>3</int></value>
>                                        </member>
>                                </struct>
>                        </value>
>                 </member>
>         </struct>
> 
> 
> Some more thoughts:
> 
> This does not allow a client to distinguish between specs not
> supported and not up-to-date capabilities structs. On the other hand a
> server-maintainer ist not able to explicitly state that 'we do _not_
> support this spec.'
> 
> This is a minor point, and I don't know wether it makes sense to add
> more complexity to the approach stated above, just to fix that. One
> solution could be to allow to 'values' vor the spec-structs. If the
> value is a bool, it must be false and it is explicitly stated that
> this spec is _not_ supported. If the value is a struct, it follows the
> above described behaviour. Would the dynamic structs eventually raise
> a problem for some implementations?
> 
> Does that make any sense anyway?
> 
> (Btw, I noticed that Dan's and my approaches are absolutely identical,
> except of the int/float thing. Funny stuff ... :)
> 
> -- 
> Best regards,
>  Andreas                          mailto:andreas.bolka <at> ...
>
does not work here http://northwestairliness.blogspot.com/

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