[Geoserver-users] App-schema: mapping simple attribute as a feature link [SEC=UNCLASSIFIED]

[Sexton Michael]

Hi

I'm following the example mapping file here to map a simple attribute field 
from another table multiple times:

https://github.com/geoserver/geoserver/blob/master/src/extension/app-schema/app-schema-test/src/test/resources/test-data/SimpleAttributeFeatureChainTest.xml

This is the mapping file:

<typeMappings>
    <FeatureTypeMapping>
        <sourceDataStore>datastore</sourceDataStore>
        <sourceType>MV_ER_MINERALOCCURRENCE</sourceType>
        <targetElement>er:MineralOccurrence</targetElement>

        <attributeMappings>
            <AttributeMapping>
                <targetAttribute>er:MineralOccurrence</targetAttribute>
                <idExpression>
                    <OCQL>GML_ID</OCQL>
                </idExpression>
            </AttributeMapping>
            <AttributeMapping>
                <targetAttribute>gml:identifier</targetAttribute>
                <sourceExpression>
                    <OCQL>IDENTIFIER</OCQL>
                </sourceExpression>
                <ClientProperty>
                    <name>codeSpace</name>
                    <value>IDENTIFIER_CODESPACE</value>
                </ClientProperty>
            </AttributeMapping>
            <AttributeMapping>
                <targetAttribute>gml:name</targetAttribute>
                <sourceExpression>
                    <OCQL>NAME</OCQL>
                </sourceExpression>
            </AttributeMapping>

            <AttributeMapping>
                <targetAttribute>er:sourceReference</targetAttribute>
                <sourceExpression>
                    <OCQL>ENO</OCQL>
                    <linkElement>SOURCEREFERENCE</linkElement>
                    <linkField>FEATURE_LINK[2]</linkField>
                </sourceExpression>
            </AttributeMapping>

</attributeMappings>
</FeatureTypeMapping>
<FeatureTypeMapping>
    <mappingName>SOURCEREFERENCE</mappingName>
    <sourceDataStore>datastore</sourceDataStore>
    <sourceType>MV_ER_SOURCEREFERENCE</sourceType>
    <targetElement>er:sourceReference</targetElement>
    <attributeMappings>

        <AttributeMapping>
            <targetAttribute>er:sourceReference</targetAttribute>
            <ClientProperty>
                <name>xlink:href</name>
                <value>URI</value>
            </ClientProperty>

            <ClientProperty>
                <name>xlink:title</name>
                <value>TITLE</value>
            </ClientProperty>
        </AttributeMapping>
        <AttributeMapping>
            <targetAttribute>FEATURE_LINK[2]</targetAttribute>
            <sourceExpression>
                <OCQL>ENO</OCQL>
            </sourceExpression>
        </AttributeMapping>
    </attributeMappings>
</FeatureTypeMapping>


The sourceReference attribute is defined in 
http://schemas.earthresourceml.org/2.0/mineralOccurrence.xsd as:

<element maxOccurs="unbounded" name="sourceReference" nillable="true">
            <annotation>
              <appinfo>
                <targetElement 
xmlns="http://www.opengis.net/gml/3.2";>gmd2:CI_Citation</targetElement>
              </appinfo>
            </annotation>
            <complexType>
              <complexContent>
                <extension base="gml:AbstractMetadataPropertyType">
                  <sequence/>
                  <attributeGroup ref="gml:AssociationAttributeGroup"/>
                </extension>
              </complexContent>
            </complexType>
</element>

But I get this error:

Error occurred getting featuresjava.util.NoSuchElementException: No top level 
element found in schemas: 
{http://xmlns.earthresourceml.org/EarthResource/2.0}sourceReferenceNo top level 
element found in schemas: 
{http://xmlns.earthresourceml.org/EarthResource/2.0}sourceReference

I've seen this error before, when trying to map gml:metadataProperty, which I 
managed to get around using the targetAttributeNode, eg:


<mappingName>METADATA</mappingName>
<sourceDataStore>datastore</sourceDataStore>
<sourceType>MV_CIT_CI_CITATION</sourceType>
<targetElement>gml:metaDataProperty</targetElement>
<attributeMappings>

    <AttributeMapping>
    <targetAttribute>gml:metaDataProperty/gml:GenericMetaData</targetAttribute>
    <targetAttributeNode>mrl:LI_Source_PropertyType</targetAttributeNode>
    </AttributeMapping>


But in the case of er:soruceReference, there is no node to map to. It's a 
reference intended to have xlink:href and xlink:title attributes. Is there a 
solution here?

Thanks


Michael Sexton


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