Figure 2.

The metadata maintenance toolset. In the rear window, the schema viewer shows the Membrane Properties Resource metadata description in tabular form. This information can alternatively be shown as an Entity relationship diagram or extended markup language. Selection of the “Receptor_properties” grid shows the detailed metadata annotation: description, concept identification, and semantic relationship (only for columns). The administrator can preview the underlying data to clarify the content. The front window shows the versioning update tool showing the differences (deltas) between previous and current versions with controls to resolve them.