Field Counts and OIA descriptor

The Field Counts and OIA descriptor is required and must be unique. That is, every Description tab must contain one and only one Field Counts and OIA descriptor.

This should not cause you any trouble in practice, for the following reasons:
  • Although the Field Counts and OIA descriptor itself is required, only one of the three tests that it contains is required. Therefore the actual requirement is that every <description> element must contain one and only one OIA descriptor.
  • The AME enforces these rules and will not let you mistakenly include more than one Field Counts and OIA descriptor in a Description tab. For example, the Delete button does not have any effect when you try to delete the Field Counts and OIA descriptor, and the Descriptor list box does not contain a <new> entry for the Field Counts and OIA descriptor.