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. 11-51 versa) 1 2 3 5 67 8 could be punched either as: or as: 1 1 2 7 27 5 3 3 6 8 72 72 5 4 6 8 If the hierarchy consists of several bushes, rather than one connected tree, bushes are separated by single blank cards. Two consecutive blank cards end the hierarchy. 5.2. The Document Tape To avoid the necessity of submitting document collections on cards for each retrieval run, a prewritten tape of binary documents can be used. These tapes are written by a program called [OCRerr]CTAP. The control cards for [OCRerr]CTAP contain asterisks (*) in column 1, and control words left-ad[OCRerr]usted with trailing blanks in columns 2-6. Data cards are submitted on [OCRerr] and the tape is written on A6. The first data card may be the control card *START. This card is used if additional data are being added to a previou&ly written document tape. If it is omitted, it is assumed that a blank tape is mounted on A6.