A rigid inclusion ground improvement system: the collection of load transferplatforms and rigid inclusion columns whose information content is jointlyinterpretable because they were built within one treated area. It is a group, not asampling feature: a system has an extent but no position, which is what the optionalextent of diggs:AbstractSamplingFeatureGroupType carries. The diggs:RITreatedAreathey were built within is the warrant for interpreting the columns and platformsjointly. The treated area and the working platforms are properties ofdiggs:RITreatedArea, not of this group. The extent of the group is not the treatedfootprint, and the two should not be assumed equal: it is the area over which thegroup acts or within which its members lie, and a system's members routinely includeexploratory boreholes drilled outside the improved footprint to characterize it, soit is normally the larger. The treated footprint is the featureExtent ofdiggs:RITreatedArea. Membership is declared by the members:diggs:LoadTransferPlatform and diggs:RIColumn each cite this group through theinherited diggs:samplingFeatureGroupRef, and the group holds no references to them.
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<element name="RigidInclusionSystem" type="diggs:RigidInclusionSystemType" substitutionGroup="diggs:AbstractSamplingFeatureGroup"><annotation><documentation>A rigid inclusion ground improvement system: the collection of load transfer platforms and rigid inclusion columns whose information content is jointly interpretable because they were built within one treated area. It is a group, not a sampling feature: a system has an extent but no position, which is what the optional extent of diggs:AbstractSamplingFeatureGroupType carries. The diggs:RITreatedArea they were built within is the warrant for interpreting the columns and platforms jointly. The treated area and the working platforms are properties of diggs:RITreatedArea, not of this group. The extent of the group is not the treated footprint, and the two should not be assumed equal: it is the area over which the group acts or within which its members lie, and a system's members routinely include exploratory boreholes drilled outside the improved footprint to characterize it, so it is normally the larger. The treated footprint is the featureExtent of diggs:RITreatedArea. Membership is declared by the members: diggs:LoadTransferPlatform and diggs:RIColumn each cite this group through the inherited diggs:samplingFeatureGroupRef, and the group holds no references to them.</documentation></annotation></element>