Indexes contain index keys, which define the fields the index is built on. You create an index key by adding an Index Field element under the index.
INDEX FIELD ATTRIBUTES
| Field | The field you need to index. Typically this is the field by which you filter the database. |
| OrdinalPosition | The Position of this field in a multi-column index. |
| SortOrder | Either Ascending or Descending, depending on how you sort the index. |