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<title>RE: [mapguide-users] RE: WMS Data Source?</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>> I guess the only problem is that
the server service has to know what the url for the "local"
DTDs is.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Yeah, there’s a lot of open-endedness in
terms of installation possibilities, but theoretically, these DTDs are static,
so finding a single public location is probably adequate. An installation
double-tasked as both extranet and intranet server can always point to some
place external server’s content for these files (I doubt you’d want two flavors
of DTD.) Would I be over-reaching in saying that this would satisfy a fair
number of use cases?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>> for instance serving WMS internally
and externally from the same server but through different DNS entries / IP
addresses<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hmmm… if two IPs or subdomains resolve to
the same MapGuide HttpHandler, it’s not clear to me that the present
implementation isn’t going to know the difference… for WMS for sure, (and for
all of MapGuide as well, I’m not sure), as I think the configuration
information is stored relative to the binaries on the server. Either way, you’re
going to expose the same layers in the WMS either way, so there may not be much
advantage to two paths to the same HttpHandler.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>That said, it wouldn’t be hard for the web-tier
HttpHandler to ask for a nuanced config file from the server (given that
somebody wants to modify the OS code,) but that functionality doesn’t exist
yet. Certainly that’s the strength of OS over shrink-wrapped code: there’s no
way for us developers to conceive – a priori – of every possible installation
the site administrator will want, so we try to address the majority cases (make
simple things simple and complex things possible, as the saying goes) but with
the source, the creative site administrator has a great deal more flexibility.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Anyway, happy Friday, and have a great
weekend.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- Thomas<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Jason Birch
[mailto:Jason.Birch@nanaimo.ca] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 03, 2006
6:56 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">users@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users] RE:
WMS Data Source?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Nope, that’s Friday Night Bleary-eyed
Syndrome on my part.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 color=navy face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:navy'>Heh. Got that going on myself...</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Ideally, though, you’re right: the truly
robust installation will simply host the DTDs on its own webserver, updating
the templates accordingly. That’s not hard for the site admin to do,
either.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I guess the only problem is that
the server service has to know what the url for the "local"
DTDs is. This will vary based on the installation, which isn't a big deal
(set a value in serverconfig), but it will also vary based on the network used
to access the web extensions, for instance serving WMS internally and
externally from the same server but through different DNS entries / IP
addresses.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I guess if the value was set in
serverconfig to the default OGC server, and the admin had the option to change
it, then this would put the responsibility in the hands of the site
administrator to make sure they were pointing to a web-accessible DTD for all
of their users.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Jason</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Jason Birch
[mailto:Jason.Birch@nanaimo.ca] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 03, 2006
6:06 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">users@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users] RE:
WMS Data Source?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>OK, weird choice from the specification
pov then. Counting on the persistence of a single external
resource in a distributed system doesn't seem like a great idea. One
change brings the whole thing tumbling down.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>What do you mean by ourselves? Included in the
MapGuide installation (local reference)? Hosted somewhere at OSGeo?</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Jason</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Thomas M.
Tuerke<br>
<b><span style='font-weight:bold'>Sent:</span></b> Fri 2006-11-03 5:49 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">users@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users] RE:
WMS Data Source?</span></font><o:p></o:p></p>
</div>
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<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi Jason,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Just a bit of historical perspective:</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.25in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>> … instead of digitalearth
(weird choice):</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Deprecated, perhaps, but not necessarily weird. It’s what
the relevant specs call for, and until recently they seemed to work just fine.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Fortunately, it looks like we’ve decided to host the DTD
files ourselves to eliminate that external dependency.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>- Thomas</span></font><o:p></o:p></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Jason Birch
[mailto:Jason.Birch@nanaimo.ca] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 03, 2006
5:34 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">users@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users] RE:
WMS Data Source?</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>This is a known issue:</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><a href="https://mapguide.osgeo.org/servlets/Scarab?id=MG434"><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>https://mapguide.osgeo.org/servlets/Scarab?id=MG434</span></font></a><o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>It looks like you may be able to fix it by grabbing the
three fixed files from SVN:</span></font><o:p></o:p></p>
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<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><a
href="https://mapguide.osgeo.org/source/browse/mapguide/branches/1.0.x/MgDev/Server/src/Wms/"><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>https://mapguide.osgeo.org/source/browse/mapguide/branches/1.0.x/MgDev/Server/src/Wms/</span></font></a><o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>or just updating the AWD templates on your site to hit OGC
instead of digitalearth (weird choice):</span></font><o:p></o:p></p>
</div>
<div><pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><a
href="http://schemas.opengis.net/wms/1.0.0/capabilities_1_0_0.dtd"><font
face=Arial><span style='font-family:Arial'>http://schemas.opengis.net/wms/1.0.0/capabilities_1_0_0.dtd</span></font></a><o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><a
href="http://schemas.opengis.net/wms/1.1.0/capabilities_1_1_0.dtd"><font
face=Arial><span style='font-family:Arial'>http://schemas.opengis.net/wms/1.1.0/capabilities_1_1_0.dtd</span></font></a><o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><a
href="http://schemas.opengis.net/wms/1.1.1/capabilities_1_1_1.dtd"></a></span></font><font
face=Arial><span style='font-family:Arial'><a
href="http://schemas.opengis.net/wms/1.1.1/capabilities_1_1_1.dtd">http://schemas.opengis.net/wms/1.1.1/capabilities_1_1_1.dtd</a></span></font><o:p></o:p></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>respectively, for the three templates.</span></font><o:p></o:p></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I recall something similar with LiteView in MapGuide 6.x, and I think I had to repoint to a local DTD. Bit fuzzy on that though; I gave up on LiteView pretty quickly.</span></font><o:p></o:p></pre></div>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Jason</span></font><o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> <st1:PersonName
w:st="on">Andy Morsell</st1:PersonName><br>
<b><span style='font-weight:bold'>Sent:</span></b> Fri 2006-11-03 5:12 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">users@mapguide.osgeo.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [mapguide-users] RE:
WMS Data Source?</span></font><o:p></o:p></p>
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<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'>There is
an OSGeo FDO WMS data provider for this purpose<br>
(<a
href="https://mapguide.osgeo.org/servlets/ProjectDocumentList?folderID=100&expand">https://mapguide.osgeo.org/servlets/ProjectDocumentList?folderID=100&expand</a><br>
Folder=100&folderID=0). However, I just tried working with it and
there<br>
appears to be a problem today. If you try to use it to define a data<br>
connection, and then enter a WMS server name and press the Test Connection<br>
button, you will get an error<br>
<br>
"An exception occurred in FDO component.<br>
XML Document parse error at line 8 column 3: An exception occurred!<br>
Type:NetAccessorException, Message:The host/address 'www.digitalearth.gov'<br>
could not be resolved "<br>
<br>
It appears that the FDO provider is looking up a DTD at digitalearth.gov and<br>
their web site is currently down (at least on my end). </span></font><o:p></o:p></p>
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