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"In every SML model there is a distinguished subset of the documents that comprise it" reword: subset of the model's documents
Reworded paragraph as follows: In every SML model there are two distinguished subsets of the model's documents, the definition documents and the instance documents. The model's definition documents describe the abstract structure of the model, and provide much of the information a model validator needs to decide whether the model as a whole is valid. The model's instance documents describe or support the description of the individual resources the model portrays.