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 -48 3 must match a word with either concept 22 or lO[OCRerr]. The structural and syntactic data are supplied, as usual, from the tree type to be specified later. d) following the dollar sign ($) ending the node conditions fields, a final, miscellaneous field appears. This field specifies whether trees or types are being defined, what types if any are being used in the tree definitions, and what the serial number(s) of the output tree(s) are. If trees, rather than types, are being defined, the dollar sign ($) is followed with a set of tree specifications, separated by commas. Each specification consists of a type number, identifying the standard type which supplies the syntactic and structural data, and a serial number code. The type number is simply an integer, identifying the tree in Table 6. It is followed immediately by the serial number code, which is one of the following: i) + (plus sign) indicating a serial number one greater than the last serial number assigned; ii) * (asterisk) indicating a serial number equal to the last serial number assigned; iii) I (slash) followed by an integer, which assigns this integer as a serial number. If the syntactic and structural data are supplied with the tree definition, instead of from a type, the type number in the tree specification should be explicitly set to zero. Any number of tree specifications may be given, separated by commas, to define several trees at once. For example, one can simultaneously define trees to represent "information retrieval is ..." and 11retrieving information by ..." in this manner. If a new type is defined, this last field should end with an integer followed by either "T" or "P". This declares the structure and syntactic conditions defined on this code to be a standard tree type, numbered with the integer provided. This rule applies