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| GeoCommunity Mailing List |
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| Subject: | Re: [gislist] google maps and OGC Testing |
| Date: |
02/28/2005 11:25:01 AM |
| From: |
Paul Ramsey |
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Anthony Quartararo wrote:
> You say that "factors like map generation, response time etc. are not a
> factor of the specification, rather the vendor implementation of the spec":
> this may be true to some extent, but are there really so many possibilities
> of implementing a "standard" that it would manifest itself in significant
> differences between vendors ?
Anthony, your mail was full of rhetorical questions, but this one in
particular needs a response: the answer is a full throated *yes*. And it
applies to all kinds of standards.
I can make a perfectly specified 0.5" screw, with the exact thread
spacing and head form, out of plastic, and it will perform very
differently from a stainless steel screw, despite having the exact
specified dimensions necessary for interoperability with other screws.
Similarly, I can stand up two WMS servers, using the same software and
data on both, and get radically different performance, if I do not use a
spatial index on one, and do on another.
Standards and implementation of standards are different things. There
can be fast and slow implementations of the same standard. The very idea
of a "reference implementation" feeds into this idea: a "reference
implementation" of a standard is one that is intended to be functionally
complete, but not necessarily either fast or user friendly.
Paul
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