ISR10 The Indexing Function chapter Joseph John Rocchio Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. 2-12 [OCRerr] *1 I I I I I I i 3 I I I I I I I I I i I Radiation 0£ li[OCRerr]ht waves occurs above the critical temper[OCRerr]ture. Syntactic [OCRerr]ependency Tree Fi[OCRerr]e 2.3 i I natural language, they necessarily involve text processing algorithms more costly in terms 0£ complexity and time, in addition tp requiring more storage. The degree to which such index languages justi£y their additional cost in terms 0£ increased retrieval per£ormance is at the present time an open questione 5. Optimizing the Index Trans£ormation The two major aspects 0£ automatic indexing algorithms are the mechanical detection 0£ in£ormation carrying elements 0£ the natural language and the representation 0£ these elements in the index language. To be use£ul, the recognition procedures nnist be applicable to a su££iciently wide class 0£ documents such as will be £ound in the literature 0£ some subject specialty. lue to the variations in usage I