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[Kristen Eberlein]

Here is the updated content: Weak and strong constraints Constraints can be classified into two categories: Weak and strong. This classification determines whether processors enforce strict compatibility during @conref or @conkeyref resolution. Strong constraints Constraints for which processors enforce strict compatibility during @conref or @conkeyref resolution. Weak constraints Constraints for which a processor does not enforce strict compatibility during @conref or @conkeyref resolution. By default, constraints are weak unless they are explicitly designated as strong. Any constraint declaration can designate a constraint as strong. A constraint can be designated as strong by prefixing the letter s to the domains attribute contribution, for example, s(topic task strictTaskbody-c) . Processors also can be configured to treat all constraints as strong. The following behavior is expected of processors: Processors MAY perform constraint compatibility checking. If processors perform constraint compatibility checking, they SHOULD enforce strict compatibility for strong constraints. Processors MAY have an option for configuring whether all constraints are treated as strong constraints. -- Best, Kris Kristen James Eberlein Chair, OASIS DITA Technical Committee Principal consultant, Eberlein Consulting www.eberleinconsulting.com +1 919 682-2290; kriseberlein (skype)