Dap:Attribute Extension Example 4
From OPeNDAP Documentation
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Example 4
Here we mingle WCS content into the DDX document. In this example the wcs:CoverageDescription contains/encapsulated the DDX content. In addition, key components of the coverage such as the wcs:Field elements are correctly associated with the DDX elements that they are describing.
Source XML
<?xml version="1.0" encoding="UTF-8"?>
<Dataset name="200803061600_HFRadar_USEGC_6km_rtv_SIO.nc"
xmlns="http://xml.opendap.org/ns/DAP2"
xmlns:wcs="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"
>
<wcs:CoverageDescription>
<ows:Title>Near-Real Time Surface Ocean Velocity</ows:Title>
<ows:Abstract>CoverageDescription generated by OPeNDAP WCS UseCase 2.0</ows:Abstract>
<wcs:Identifier>coverage/200803061600_HFRadar_USEGC_6km_rtv_SIO.nc</wcs:Identifier>
<wcs:Domain>
<wcs: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>
</wcs:SpatialDomain>
<wcs:TemporalDomain>
<gml:timePosition>2008-03-27T16:00:00.000Z</gml:timePosition>
</wcs:TemporalDomain>
</wcs:Domain>
<wcs:Range>
<Attribute name="NC_GLOBAL" type="Container">
<Attribute name="Conventions" type="String">
<value>CF-1.1</value>
</Attribute>
<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>
<Grid name="u">
<wcs:Field>
<ows:Title>surface_eastward_sea_water_velocity</ows:Title>
<ows:Abstract>Eastward component of a 2D sea surface velocity vector.</ows:Abstract>
<wcs:Identifier>u</wcs:Identifier>
<wcs:Definition>
<ows:AnyValue/>
</wcs:Definition>
<wcs:NullValue>-32768</wcs:NullValue>
<owcs:InterpolationMethods>
<owcs:DefaultMethod>nearest</owcs:DefaultMethod>
</owcs:InterpolationMethods>
</wcs:Field>
<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>
</wcs:Range>
<wcs:SupportedCRS>urn:ogc:def:crs:EPSG::4326</wcs:SupportedCRS>
<wcs:SupportedFormat>netcdf-cf1.0</wcs:SupportedFormat>
<wcs:SupportedFormat>dap2.0</wcs:SupportedFormat>
</wcs:CoverageDescription>
<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
The extracted wcs:CoverageDescription element:
<wcs:CoverageDescription xmlns="http://xml.opendap.org/ns/DAP2" xmlns:wcs="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"> <ows:Title>Near-Real Time Surface Ocean Velocity</ows:Title> <ows:Abstract>CoverageDescription generated by OPeNDAP WCS UseCase 2.0</ows:Abstract> <wcs:Identifier>coverage/200803061600_HFRadar_USEGC_6km_rtv_SIO.nc</wcs:Identifier> <wcs:Domain> <wcs: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> </wcs:SpatialDomain> <wcs:TemporalDomain> <gml:timePosition>2008-03-27T16:00:00.000Z</gml:timePosition> </wcs:TemporalDomain> </wcs:Domain> <wcs:Range> <wcs:Field> <ows:Title>surface_eastward_sea_water_velocity</ows:Title> <ows:Abstract>Eastward component of a 2D sea surface velocity vector.</ows:Abstract> <wcs:Identifier>u</wcs:Identifier> <wcs:Definition> <ows:AnyValue/> </wcs:Definition> <wcs:NullValue>-32768</wcs:NullValue> <owcs:InterpolationMethods> <owcs:DefaultMethod>nearest</owcs:DefaultMethod> </owcs:InterpolationMethods> </wcs:Field> </wcs:Range> <wcs:SupportedCRS>urn:ogc:def:crs:EPSG::4326</wcs:SupportedCRS> <wcs:SupportedFormat>netcdf-cf1.0</wcs:SupportedFormat> <wcs:SupportedFormat>dap2.0</wcs:SupportedFormat> </wcs:CoverageDescription>
Namespace Passing 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
The DAP2 DDX document minus the foreign namespace XML:
<Dataset xmlns="http://xml.opendap.org/ns/DAP2" xmlns:wcs="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"
name="200803061600_HFRadar_USEGC_6km_rtv_SIO.nc">
<Attribute name="NC_GLOBAL" type="Container">
<Attribute name="Conventions" type="String">
<value>CF-1.1</value>
</Attribute>
<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>
<Grid name="u">
<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>
