WCS Site Analysis
Validation Analysis of WCS Services
I did some quick and dirty validation analysis of the WCS service responses from existing WCS servers.
Site: CEOP AIRS
URL: http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET
Sampled: 04/29/2008
GetCapablities Response
Request URL: http://g0dup05u.ecs.nasa.gov/cgi-bin/ceopAIRX2RET?SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCapabilities
WCS Schema: http://schemas.opengis.net/wcs/1.0.0/wcsCapabilities.xsd
Error 1
Message: org.jdom.input.JDOMParseException: Error on line 78: cvc-complex-type.2.4.a: Invalid content was found starting with element 'description'. One of '{"http://www.opengis.net/wcs":lonLatEnvelope}' is expected.
Action: Moved <description> to before the <name> in each <CoverageOfferingBrief>.
Error 2
Message: org.xml.sax.SAXParseException: cvc-complex-type.3.1: Value 'WGS84(DD)' of attribute 'srsName' of element 'lonLatEnvelope' is not valid with respect to the corresponding attribute use. Attribute 'srsName' has a fixed value of 'urn:ogc:def:crs:OGC:1.3:CRS84'.
Action: Changing value of srsName from WGS84(DD) to urn:ogc:def:crs:OGC:1.3:CRS84 repairs the problem. Also, since the value is FIXED by the schema the attribute srsName can be omitted (I think...)
Document validates
DescribeCoverage Response
WCS Schema: http://schemas.opengis.net/wcs/1.0.0/describeCoverage.xsd
Error 1
Message: org.jdom.input.JDOMParseException: Error on line 10: cvc-complex-type.2.4.a: Invalid content was found starting with element 'description'. One of '{"http://www.opengis.net/wcs":lonLatEnvelope}' is expected.
Action: Moved <description> to before the <name> in each <CoverageOffering>.
Error 2
Message: org.jdom.input.JDOMParseException: Error on line 7: cvc-complex-type.3.1: Value 'WGS84(DD)' of attribute 'srsName' of element 'lonLatEnvelope' is not valid with respect to the corresponding attribute use. Attribute 'srsName' has a fixed value of 'urn:ogc:def:crs:OGC:1.3:CRS84'.
Action: Changing value of srsName from 'WGS84(DD)' to 'urn:ogc:def:crs:OGC:1.3:CRS84' repairs the problem. Also, since the value is FIXED by the schema it can be omitted. Just leaving out the srsName attribute works too.
Error 3
Message: org.jdom.input.JDOMParseException: Error on line 32: cvc-complex-type.2.4.a: Invalid content was found starting with element 'gml:Envelope'. One of '{"http://www.opengis.net/gml":Grid, "http://www.opengis.net/gml":Polygon}' is expected.
Action: In each <wcs:spatialDomain> moved all <gml:Envelope>s to before the <gml:RectifiedGrid>s.
Error 4
Message: org.jdom.input.JDOMParseException: Error on line 699: cvc-complex-type.2.4.a: Invalid content was found starting with element 'gml:timePeriod'. One of '{"http://www.opengis.net/gml":timePosition, "http://www.opengis.net/wcs":timePeriod}' is expected.
Action: Changed name space of <timePeriod> to WCS 1.0.0 namespace.
Error 5
Message: org.jdom.input.JDOMParseException: Error on line 700: cvc-complex-type.2.4.a: Invalid content was found starting with element 'gml:beginPosition'. One of '{"http://www.opengis.net/wcs":beginPosition}' is expected.
Action: Changed name space of <beginPosition> to WCS 1.0.0 namespace.
Error 6
Message: org.jdom.input.JDOMParseException: Error on line 701: cvc-complex-type.2.4.a: Invalid content was found starting with element 'gml:endPosition'. One of '{"http://www.opengis.net/wcs":endPosition}' is expected.
Action: Changed name space of <endPosition> to WCS 1.0.0 namespace.
Error 7
Message: org.jdom.input.JDOMParseException: Error on line 709: cvc-complex-type.2.4.a: Invalid content was found starting with element 'description'. One of '{"http://www.opengis.net/wcs":axisDescription, "http://www.opengis.net/wcs":nullValues}' is expected.
Action: Moved <description> to before the <name> in each <RangeSet>.
Error 8
Message: org.jdom.input.JDOMParseException: Error on line 720: cvc-complex-type.2.4.a: Invalid content was found starting with element 'supportedInterpolations'. One of '{"http://www.opengis.net/wcs":supportedFormats}' is expected.
Action: Moved <supportedFormats> to before <supportedInterpolations>
Error 9
Message: org.jdom.input.JDOMParseException: Error on line 726: cvc-enumeration-valid: Value 'Nearest neighbor' is not facet-valid with respect to enumeration '[nearest neighbor, bilinear, bicubic, lost area, barycentric, none]'. It must be a value from the enumeration.
Action: Changed the case of "Nearest neighbor" to "nearest neighbor"
Error 10
Message: org.jdom.input.JDOMParseException: Error on line 727: cvc-enumeration-valid: Value 'Nearest neighbor' is not facet-valid with respect to enumeration '[nearest neighbor, bilinear, bicubic, lost area, barycentric, none]'. It must be a value from the enumeration.
Action: Changed the case of "Nearest neighbor" to "nearest neighbor"
Document validates
Site: DataFed OGC_NASA
URL: http://webapps.datafed.net/ogc_NASA.wsfl
Sampled: 04/29/2008
GetCapablities Response
Request URL: http://webapps.datafed.net/ogc_NASA.wsfl?SERVICE=WCS&VERSION=1.0.0&REQUEST=GetCapabilities
WCS Schema: http://datafed.net/xs/OGC/wcs/1.0.0/wcsfix.xsd
Document validates.
WCS Schema: http://schemas.opengis.net/wcs/1.0.0/wcsCapabilities.xsd
Error 1
Message: org.jdom.input.JDOMParseException: Error on line 2: cvc-elt.1: Cannot find the declaration of element 'WCS_Capabilities'.
Action: Added the namespace declaration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" and the schemaLocation xsi:schemaLocation="http://www.opengis.net/wcs http://schemas.opengis.net/wcs/1.0.0/wcsCapabilities.xsd attributes to the WCS_Capabilities element.
Error 2
Message: org.jdom.input.JDOMParseException: Error on line 71: cvc-complex-type.3.1: Value 'CRS84' of attribute 'srsName' of element 'lonLatEnvelope' is not valid with respect to the corresponding attribute use. Attribute 'srsName' has a fixed value of 'urn:ogc:def:crs:OGC:1.3:CRS84'.
Action: Changed all occurrences of "WGS84(DD)" to "urn:ogc:def:crs:OGC:1.3:CRS84"
Document validates.
DescribeCoverage Response
Request URL: http://webapps.datafed.net/ogc_NASA.wsfl?SERVICE=WCS&VERSION=1.0.0&REQUEST=DescribeCoverage
WCS Schema: http://datafed.net/xs/OGC/wcs/1.0.0/wcsfix.xsd
Document validates.
WCS Schema: http://schemas.opengis.net/wcs/1.0.0/describeCoverage.xsd
Error 1
Message: org.jdom.input.JDOMParseException: Error on line 1: cvc-elt.1: Cannot find the declaration of element 'CoverageDescription'.
Action: Added the namespace declaration xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" and the schemaLocation xsi:schemaLocation="http://www.opengis.net/wcs http://schemas.opengis.net/wcs/1.0.0/describeCoverage.xsd attributes to the CoverageDescription element.
Error 2
Message: org.jdom.input.JDOMParseException: Error on line 10: cvc-complex-type.3.1: Value 'WGS84(DD)' of attribute 'srsName' of element 'lonLatEnvelope' is not valid with respect to the corresponding attribute use. Attribute 'srsName' has a fixed value of 'urn:ogc:def:crs:OGC:1.3:CRS84'.
Action: Changed all occurrences of srsName="WGS84(DD)" to srsName="urn:ogc:def:crs:OGC:1.3:CRS84"
Error
Message: org.jdom.input.JDOMParseException: Error on line 40: cvc-datatype-valid.1.2.1: 'image/gif' is not a valid value for 'Name'.
Action:
Document Validation Failed
But that's not surprising since the DataFed is using their own version of the WCS schema.
