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The focus is defined as follows: "The first three components of the dynamic context (context item, context position, and context size) are called the focus of the expression." The value of the context position includes: "Definition: ... When the focus is defined, the value of the context position is an integer greater than zero. ..." Perhaps this should be stated as: "Definition: ... When the context item is defined, the value of the context position is an integer greater than zero. ..." to avoid a circular definition of the context position in terms of the focus, of which context position is itself a part. Also, in the definition of context, size perhaps "Its value is always an integer greater than zero. " should be amended to "When the context item is defined, its value is always an integer greater than zero. "
This is editorial. My preference is to change in the other direction, clearly stating that the focus is either defined (as a whole) or not, and adding "when the focus is defined" to each of these components.