ISR11 Information Analysis and Dictionary Construction chapter G. Salton 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. IV-27 corresponding in this case to either concept numbers 102, 188 or 170, be syntactically dependent on the first component corresponding to concept 11 or 158; furthermore, the second component is specified as an adjective, whereas the first component is specifie& as a noun. Examples corresponding to each of the syntactic format frames listed are sho[OCRerr]'ri on the right-hand side of Fig. 7. For instance, the first tree of format type 1 might correspond to English phrases such as syntactic analysis11, "syntactic synthesis11, `tphrase relations1t, `1subject correspondence!?, [OCRerr] so on. Because of the multiple assignment of concepts to phrase components, and the multiplicity of syntactic format types s[OCRerr]ecified for each phrase, a given criterion phrase generally represents many hundreds of English phrases or sentences. This feature is used to match the many sentence parts in the language which are semantically similar, but syntactically quite distinct. Since the syntactic dependency specifications are always directed from a dependent component to a governing component, the grammatical structure of a syntactic phrase, unlike that of a statistical phrase, is well determined. For the first example of Fig. 7 (format type 1) the string `phrase relations!? is an acceptable interpretation, but not "relational phrase1'; similarly for format type 13 an acceptable interpretation is 1'this analysis is applicable to Russian grammar", but the transposed T1this gr[OCRerr]mar is applicable to Fussian analysis" would not be accepted. D) The Concept Hierarchy Hierarchical arrangements of subject headings have been `ised for [OCRerr] years in library science and related documentation acti[OCRerr]jities. In general, such arrangements make it possible to classify more specific topic `inder