Decision Table Languages and Systems by John R. Metzner, Robert L. Ashenhurst, Bruce H. Barnes PDF

By John R. Metzner, Robert L. Ashenhurst, Bruce H. Barnes

ISBN-10: 0124920500

ISBN-13: 9780124920507

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Hopefully, the examples will show the interplay of outer language, decision table, and base language semantics described previously. They should at least illustrate the selfdocumenting powers of decision tables and describe decision/action situations with which to illustrate improved decision table forms later. In any case, these examples should provide a backdrop against which one can project suggested generalizations and improvements in the decision table mechanism. Update-Merge Program This program is commonly used in the maintenance of source language programs.

Format Features The use of left-hand stubs is universal among vertical-rule languages. In limited entry form, this is the only format feature. In extended entry 49 SEMANTIC FEATURES form, a natural extension is the fill-in in which the entry string is inserted within the stub string, replacing a reserved marker such as VS, OP, or — TAB40 generalizes more, providing right-hand stubs called endings. A nonnull rule entry signals that a phrase must be constructed by concatenating strings in the order stub, entry, ending.

To eliminate the need for this duplication, a number of decision table languages allow the use of digits for limited entry action entries. DECIUS and SMP have this feature and use the values of the digit entries to establish the order in which action statements are generated for each rule. 4. Format conventions for action entries tend to be more restrictive than those for conditions. SMP requires actions to be in limited entry form while providing mixed entry form for conditions. Among the mixed 54 3.

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Decision Table Languages and Systems by John R. Metzner, Robert L. Ashenhurst, Bruce H. Barnes


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