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This is where constraints in the upcoming DITA 1.2 spec comes to the rescue, as it provides a means to specialize without specialization, not by creating new elements, but by constraining your usage of DITA elements to those you actually use. This results in a writing team needing less than the full standard, usefully constraining what tags a writer can use in order have them better focus on the job that they are supposed to do. His take on using them was to start with the most constrained condition, and then loosen the constraints as required as needs evolve.