WMS 1.3.0 support (for OWSLib proper)

[roomthily]

Some notes related to implementation.

[roomthily]

For the BBOX query parameter.
CRS:84: (long, lat)
EPSG:4326: (lat, long)

[roomthily]

Axis patch implemented for 4326, 4269 and 4267 but this is not a complete list and none of the options/other implementations are complete.

See 6af3aa4

[roomthily]

Updating the Extent handling to the complete Dimension handling (I don't know what the deal is 1.1.1 though - reads like 1.3.0 merged Extent and Dimension into one blob). Will retain the names of the overlapping attributes for backwards compatibility.

1.3.0

<Dimension name="time" units="ISO8601" default="2006-06-23T03:10:00Z" nearestValue="0">1995-01-01/2013-12-31/PT5M</Dimension>

# with current and unitSymbol attributes optional

vs 1.1.1

<Dimension name="time" units="ISO8601"/>
<Extent name="time" default="2006-06-23T03:10:00Z" nearestValue="0">1995-01-01/2013-12-31/PT5M</Extent>

[roomthily]

The existing code just grabs the text values and the default attribute - there's no space to include the other supported attributes.

[roomthily]

Using this AZGS ArcGIS Server WMS 1.3.0:

http://services.azgs.az.gov/ArcGIS/services/aasggeothermal/ORWellHeaders/MapServer/WMSServer?request=GetCapabilities&service=WMS

We have the following Layer nesting:

<Layer>
    <Title><![CDATA[ORWellHeaders]]></Title>
    <CRS>CRS:84</CRS>
    <CRS>EPSG:4326</CRS>
    <CRS>EPSG:3857</CRS>
    <!-- alias 3857 -->
    <CRS>EPSG:102100</CRS>
    <EX_GeographicBoundingBox><westBoundLongitude>-124.399896</westBoundLongitude><eastBoundLongitude>-116.779783</eastBoundLongitude><southBoundLatitude>41.999877</southBoundLatitude><northBoundLatitude>46.162222</northBoundLatitude></EX_GeographicBoundingBox>
    <BoundingBox CRS="CRS:84" minx="-124.399896" miny="41.999877" maxx="-116.779783" maxy="46.162222"/>
    <BoundingBox CRS="EPSG:4326" minx="41.999877" miny="-124.399896" maxx="46.162222" maxy="-116.779783"/>
    <BoundingBox CRS="EPSG:3857" minx="-13848133.077456" miny="5160961.019264" maxx="-12999865.978509" maxy="5806383.628162"/>
    <Layer queryable="1">
      <Name>Wellheader</Name>
      <Title><![CDATA[Wellheader]]></Title>
      <Abstract><![CDATA[Wellheader]]></Abstract>
    <CRS>CRS:84</CRS>
    <CRS>EPSG:4326</CRS>
    <CRS>EPSG:3857</CRS>
    <!-- alias 3857 -->
    <CRS>EPSG:102100</CRS>
    <EX_GeographicBoundingBox><westBoundLongitude>-124.399896</westBoundLongitude><eastBoundLongitude>-116.779783</eastBoundLongitude><southBoundLatitude>41.999877</southBoundLatitude><northBoundLatitude>46.162222</northBoundLatitude></EX_GeographicBoundingBox>
    <BoundingBox CRS="CRS:84" minx="-124.399896" miny="41.999877" maxx="-116.779783" maxy="46.162222"/>
    <BoundingBox CRS="EPSG:4326" minx="41.999877" miny="-124.399896" maxx="46.162222" maxy="-116.779783"/>
    <BoundingBox CRS="EPSG:3857" minx="-13848133.077456" miny="5160961.019264" maxx="-12999865.978509" maxy="5806383.628162"/>
    <Style>
      <Name>default</Name>
      <Title>Wellheader</Title>
      <LegendURL width="20" height="20">
        <Format>image/png</Format>
        <OnlineResource xlink:href="http://services.azgs.az.gov/arcgis/services/aasggeothermal/ORWellHeaders/MapServer/WmsServer?request=GetLegendGraphic%26version=1.3.0%26format=image/png%26layer=Wellheader" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" />
      </LegendURL>
    </Style>
  </Layer>
</Layer>

with the parent ORWellHeaders and the child WellHeader. OWSLib (at least in the WMS handling) uses the Layer.Name as the key for its dict of layers (contents). The parent layer doesn't have a Name element and so it's not in the returned contents list but is still accessible as the WellHeader parent for crsOptions, etc. Which is probably reasonable and this is just a note for the tests.