Report:STN/Search Syntax/Allowed Operators/Boolean and Proximity Operators

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Boolean Operators

Boolean operators (AND, OR, NOT) are available and work the same way in all databases within STN. Spacing around the Boolean Operators is required, and commas (,) or hyphens (-) can be used in place of OR with L/E-number search terms. No spaces are allowed around the commas or hyphens.[1]

Proximity Operators

The following table lists and describes the more commonly used proximity operators in STN.[1][2]

Operator Description
(W) Answers have the connected terms adjacent to each other in the order specified Default: If no operator is used to connect terms, by default the terms are connected with the (W) operator in some search files
(nW) Answers have the connected terms with 0-n intervening terms between them and the terms occur in the order specified (n = 0 to 9999)
(A) Answers have the connected terms adjacent to each other in any order
(nA) Answers have the connected terms with 0-n intervening terms between them and they occur in any order (n = 0-9999)
(L) or (NOTL) The function of (L) and (NOTL) depends on the data structure of the file, but usually refers to "information unit"
(P)/(nP)/(NOTP) The function of (P)/(nP)/(NOTP) depends on the data structure of the file, but usually refers to "paragraph"
(S)/(nS)/(NOTS) The function of (S)/(nS)/(NOTS) depends on the data structure of the file, but usually refers to "sentence" or "subfield"


The following table lists and describes some less commonly used proximity operators that are also available within STN.

Operator Description
(XW) Answers have the connected terms occur in the order specified in the same data field
(NOTW) Answers do not have the first of the connected terms immediately followed by the second
(nNOTW) Answers do not have the first of the connected terms followed by the second term with 0-n intervening words between them (n = 0 to 9999)
(XNOTW) Answers do not have the first of the connected terms followed by the second term in the same data field
(XA) Answers have the connected terms occur in any order in the same data field
(NOTA) Answers do not have the connected terms adjacent to the other term in any order
(nNOTA) Answers do not have the connected terms with 0-n intervening words between them (n = 0 to 9999) in either order
(XNOTA) Answers do not have the connected terms occur in either order in the same data field


Note: All forms of the (W) and (A) operators work the same in all databases on STN.


Sources

  1. 1.0 1.1 "STN Pocket Guide." CAS website, http://www.cas.org/support/stngen/doc/stnpocketg.html. Accessed July 20, 2011.
  2. American Chemical Society. "STN LIBRARY AND INFORMATION SCIENCE TRAINING MANUAL." CAS website, http://www.cas.org/ASSETS/404CE79B91B74B2E8DEB080BC520327B/part1lisworkbook.pdf. Accessed July 20, 2011.
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