| Tables |
| RelatedFeatures | Describes parrent/child relationships among Sampling Features |
| Sites | Describes sampling features that are point sites |
| SpatialOffsets | An explicit spatial relationship between a sampling feature relative to it's parent. |
| SpatialReferences | Describes spatial reference systems used to reference the coordinates for sites |
| Specimens | Equivalent to O&M Sampling Feature Type "Specimen". Describes physical samples or specimens. |
| SpecimenTaxonomicClassifiers | This cross-reference table allows Taxonomic Classification of Specimens as an annotation, rather than as a Result. |