The sample a diggs:RelativeLocation's position is stated relative to. Use in placeof diggs:relativeToSamplingFeatureRef where the reference point is a sample ratherthan a sampling feature. Given by reference only.
The gml:identifier value of the referenced feature, as a fully qualifiedvalue. It gives an alternative to the gml:id in xlink:href for findingthe referenced feature, mainly to reference a feature by a globallyunique identifier and where naming conflicts occur with gml:id whenaccessing data in external files.
<element name="relativeToSampleRef" type="diggs:FeatureReferenceType"><annotation><appinfo source="urn:x-gml:targetElement">diggs:AbstractSample</appinfo><documentation>The sample a diggs:RelativeLocation's position is stated relative to. Use in place of diggs:relativeToSamplingFeatureRef where the reference point is a sample rather than a sampling feature. Given by reference only.</documentation></annotation></element>