Maintenance of DITA ID Uniqueness

Serna maintains the uniqueness of DITA elements' IDs when you perform different operations with them:
  1. Insert an element with an ID one of these ways:

    1. Split an element with an ID.

    2. Paste or drag&drop an element with an ID into a scope which already has an element with the same ID value.

    In these cases, the ID value of the newly-inserted element is automatically added a suffix _1, _2, and so on.

  2. Join elements with IDs.

    When you join two elements, the ID value of the first element is used for the joint element.

    Note:

    If the first element has no ID, the joint element will also have no ID.

Important:

To enable the maintenance of DITA ID uniqueness within a map, you must first specify the ID value of the map itself.

Related concepts
DITA ID Validation
DITA ID Attributes Specifications