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1. The document is not fully self-describing, since it depends upon some otherwise agreed-upon meaning or at least prescription for using the terms actor, action and object. If these terms were just tokens with no such association, it would be hard to distinguish between John 'shot' Roger and John 'was shot by' Roger. It is not clear whether the intent was that some of the more specific terms, such as 'shot' and 'purchased' were to be known to the receiving application also, or whether they were just supposed to be tokens. 2. There might be large numbers of documents all described by the same more complicated grammar than that presented in the example. Probably performance of this kind of system would be inferior in some ways to one in which the grammar was not transmitted and parsed each time. Jeff
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