Use Group Rules in topics to build a sub structure around several rules. The attributes for determining whether the sub structure is optional or mandatory, or whether the sequence is fixed or flexible, are applied against the Group Rule. In addition, a Group Rule can be created as a child of another Group Rule, enabling even more control over your content.
The following example describes the validation requirements for two structures - one using a group rule and the other without the group rule.
Expected result: create a structure with a group rule that gives the option of adding a screen shot to a topic. If the screen shot is added then there must be the option to add a table to contain the "call out" text. However if the screen shot is not added to the topic then the rule must prohibit a table from being added. The rule must also prohibit the table from being added before the screen shot.