[Geotools-devel] [jira] (GEOT-4117) Select XML attributes on the root element

[Brett W. (JIRA) <ji...@co...>]

Brett Walker created GEOT-4117:
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             Summary: Select XML attributes on the root element
                 Key: GEOT-4117
                 URL: https://jira.codehaus.org/browse/GEOT-4117
             Project: GeoTools
          Issue Type: Improvement
          Components: app-schema plugin
         Environment: Apache Maven 3.0.4 (r1232337; 2012-01-17 19:44:56+1100)
Java version: 1.6.0_22, vendor: Sun Microsystems Inc.
Default locale: en_AU, platform encoding: Cp1252
OS name: "windows xp", version: "5.1", arch: "x86", family: "windows"
            Reporter: Brett Walker
         Attachments: SelectPropertyNameWithGmlIdAttribute.patch

The app-schema plugin doesn't allow the selection of attributes on the root element; i.e. the selection of client properties of the target element. For example the following x-path on a fictious schema will work:
bq.    {{ns:root_element/ns:nested_element/@ns:attribute}}
but the following x-path will not work:
bq.    {{ns:root_element/@ns:attribute}}
This x-path selection mechanism is not disallowed by the OGC Filter Encoding standard.

I have a use-case where a filter is required to be applied to the attribute of the root element; currently this is not supported by the app-schema plugin.

I have provided a patch which includes test cases that extends {{FeatureTypeMapping}} and {{XPath}} to allow my use-case to proceed. {{mvn clean install}} on trunk passes all tests.

In implementing {{XPath.rootElementSteps()}} I have tried to follow {{XPath.steps()}} as a template. {{FeatureTypeMapping.findMappingsFor()}} has been altered, as little as possible, to take advantage of {{XPath.rootElementSteps()}} where appropraite.

Does the app-schema documentation need to be amended? IMHO I think it doesn't. This is just a correction to a deficiency, overlooked by the original designers because they didn't have a specific use-case.

I'm happy to answer questions or provided additional details about my use-case.

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