ISR11 Operating Instructions for the SMART Text Processing and Document Retrieval System chapter M. E. Lesk Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. ii-46 sense of "being syntactically dependent upon, according to the syntactic analysis used for this sentence." The seaantic (and syntactic, if needed) data now follow; or, if this tree is being defined using a standard tree type, these data begin the field. The node condition field, except for the In or Dn subfield, is composed of a set of "relations", each "relation" being a set of one or more "relation generators". Each relation generator is either a concept number or a syntactic role code. A concept number, indicating a semantic condition, is punched as an explicit integer. A syntactic role code, indicating a syntactic condition, is punched as a letter enclosed by apostrophes. Thus, the relation generator for concept number 285 is simply 285; the relation generator for a verb is `V'. The syntactic role codes and their meanings are shown in Table 7. If a tree node is to match a sentence node, at least one relation generator in each relation must correspond to a property of the word. Relation generators are punched separately by commas, and all the relation generators in each relation are enclosed with parentheses. For example, the node condition field I3(8,l6)('[OCRerr]','s') can only match a word which: i) depends directly or indirectly on the word matching node number 3; ii) corresponds to either concept number 8 or concept number 16 in the thesaurus; iii) functions either as an object or a subject in the sentence. On the other hand, the condition field (8)(16) would only match a word which would correspond to both concept 8 and concept 16 in the thesaurus. The node condition fields correspond to nodes in sequence counting from left to right. Thus, the node condition fields (26,78)1(95)1(22,105) indicate that node 1 zrnist match a word in concept 26 or 78; node 2 zinist match a word in concept 95; and node