Dap:Attribute Extension Example 3b
From OPeNDAP Documentation
Example 3b
Here we embed an entire wcs:CoverageDescription and wcs:CoverageSummary at the top level of a DDX.
Source XML
<?xml version="1.0" encoding="UTF-8"?>
<Dataset name="200803061600_HFRadar_USEGC_6km_rtv_SIO.nc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xml.opendap.org/ns/DAP2"
xsi:schemaLocation="http://xml.opendap.org/ns/DAP2 http://xml.opendap.org/dap/dap2.xsd">
<Attribute name="wcsStuff" type="xml" >
<CoverageDescription xmlns="http://www.opengis.net/wcs/1.1" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:owcs="http://www.opengis.net/wcs/1.1/ows" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:schemaLocation="http://www.opengis.net/wcs/1.1 http://schemas.opengis.net/wcs/1.1.0/wcsDescribeCoverage.xsd http://www.opengis.net/ows/1.1 http://schemas.opengis.net/ows/1.1.0/owsAll.xsd http://www.opengis.net/wcs/1.1/ows http://schemas.opengis.net/wcs/1.1.0/owsDataIdentification.xsd http://www.opengis.net/gml/3.2 http://schemas.opengis.net/gml/3.2.1/gml.xsd">
<ows:Title>Near-Real Time Surface Ocean Velocity</ows:Title>
<ows:Abstract>CoverageDescription generated by OPeNDAP WCS UseCase 2.0</ows:Abstract>
<Identifier>coverage/200803061600_HFRadar_USEGC_6km_rtv_SIO.nc</Identifier>
<Domain>
<SpatialDomain>
<ows:BoundingBox crs="urn:ogc:def:crs:EPSG::4326">
<ows:LowerCorner>-97.8839 21.736</ows:LowerCorner>
<ows:UpperCorner>-57.2312 46.4944</ows:UpperCorner>
</ows:BoundingBox>
</SpatialDomain>
<TemporalDomain>
<gml:timePosition>2008-03-27T16:00:00.000Z</gml:timePosition>
</TemporalDomain>
</Domain>
<Range>
</Range>
<SupportedCRS>urn:ogc:def:crs:EPSG::4326</SupportedCRS>
<SupportedFormat>netcdf-cf1.0</SupportedFormat>
<SupportedFormat>dap2.0</SupportedFormat>
</CoverageDescription>
<CoverageSummary xmlns="http://www.opengis.net/wcs/1.1" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:owcs="http://www.opengis.net/wcs/1.1/ows" xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:schemaLocation="http://www.opengis.net/wcs/1.1 http://schemas.opengis.net/wcs/1.1.0/wcsDescribeCoverage.xsd http://www.opengis.net/ows/1.1 http://schemas.opengis.net/ows/1.1.0/owsAll.xsd http://www.opengis.net/wcs/1.1/ows http://schemas.opengis.net/wcs/1.1.0/owsDataIdentification.xsd http://www.opengis.net/gml/3.2 http://schemas.opengis.net/gml/3.2.1/gml.xsd">
<ows:Title>6km HF Radar data</ows:Title>
<ows:Abstract>A test dataset for use developing WCS services.</ows:Abstract>
<ows:Metadata xlink:href="http://ndp.opendap:8080/opendap/coverage/200803061600_HFRadar_USEGC_6km_rtv_SIO.nc.das"/>
<ows:WGS84BoundingBox>
<ows:LowerCorner>-97.8839 21.736</ows:LowerCorner>
<ows:UpperCorner>-57.2312 46.4944</ows:UpperCorner>
</ows:WGS84BoundingBox>
<Identifier>coverage/200803061600_HFRadar_USEGC_6km_rtv_SIO.nc</Identifier>
</CoverageSummary>
</Attribute>
<Attribute name="NC_GLOBAL" type="Container">
<Attribute name="title" type="String">
<value>Near-Real Time Surface Ocean Velocity</value>
</Attribute>
<Attribute name="institution" type="String">
<value>Scripps Institution of Oceanography</value>
</Attribute>
<Attribute name="source" type="String">
<value>Surface Ocean HF-Radar</value>
</Attribute>
<Attribute name="history" type="String">
<value>12-Mar-2008 22:26:19: NetCDF file created</value>
</Attribute>
<Attribute name="references" type="String">
<value>Terrill, E. et al., 2006. Data Management and Real-time\\012Distribution in the HF-Radar National Network. Proceedings\\012of the MTS/IEEE Oceans 2006 Conference, Boston MA,\\012September 2006.</value>
</Attribute>
</Attribute>
<Grid name="u">
<Attribute name="wcsStuff" type="xml" >
<Field>
<ows:Title>surface_eastward_sea_water_velocity</ows:Title>
<ows:Abstract>Eastward component of a 2D sea surface velocity vector.</ows:Abstract>
<Identifier>u</Identifier>
<Definition>
<ows:AnyValue/>
</Definition>
<NullValue>-32768</NullValue>
<owcs:InterpolationMethods>
<owcs:DefaultMethod>nearest</owcs:DefaultMethod>
</owcs:InterpolationMethods>
</Field>
</Attribute>
<Attribute name="standard_name" type="String">
<value>surface_eastward_sea_water_velocity</value>
</Attribute>
<Attribute name="units" type="String">
<value>m s-1</value>
</Attribute>
<Attribute name="_FillValue" type="Int16">
<value>-32768</value>
</Attribute>
<Attribute name="scale_factor" type="Float32">
<value>0.009999999776</value>
</Attribute>
<Attribute name="ancillary_variables" type="String">
<value>DOPx</value>
</Attribute>
<Array name="u">
<Int16/>
<dimension name="time" size="1"/>
<dimension name="lat" size="460"/>
<dimension name="lon" size="701"/>
</Array>
<Map name="time">
<Int32/>
<dimension name="time" size="1"/>
</Map>
<Map name="lat">
<Float32/>
<dimension name="lat" size="460"/>
</Map>
<Map name="lon">
<Float32/>
<dimension name="lon" size="701"/>
</Map>
</Grid>
<dataBLOB href=""/>
</Dataset>
Namespace Blocking Transform
Returns all elements NOT in the DAP2 namespace. Or in other words, discard elements in the DAP2 namespace:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:dap="http://xml.opendap.org/ns/DAP2" >
<xsl:output method='xml' version='1.0' encoding='UTF-8' indent='yes'/>
<xsl:strip-space elements="*" />
<xsl:template match="*">
<xsl:choose>
<xsl:when test="namespace-uri()!='http://xml.opendap.org/ns/DAP2'">
<xsl:copy >
<xsl:call-template name="textAndattributes" />
<xsl:apply-templates />
</xsl:copy>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates />
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="@*|text()" />
<xsl:template name="textAndattributes" ><xsl:copy-of select="text()|@*" /></xsl:template>
</xsl:stylesheet>
Result
And we get back just the CoverageDescription and the CoverageSummary:
Namespace Passing Transform
Returns all elements IN the DAP2 namespace:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:dap="http://xml.opendap.org/ns/DAP2" >
<xsl:output method='xml' version='1.0' encoding='UTF-8' indent='yes'/>
<xsl:strip-space elements="*" />
<xsl:template match="*">
<xsl:choose>
<xsl:when test="namespace-uri()='http://xml.opendap.org/ns/DAP2'">
<xsl:copy >
<xsl:call-template name="textAndattributes" />
<xsl:apply-templates />
</xsl:copy>
</xsl:when>
<xsl:otherwise>
<xsl:apply-templates />
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template match="@*|text()" />
<xsl:template name="textAndattributes" ><xsl:copy-of select="text()|@*" /></xsl:template>
</xsl:stylesheet>
Result
The DAP DDX document minus the foreign namespace XML.
