Boolean
and Proximity Operators [ Top
] You can use operators and modifiers in query expressions
to instruct the search engine to widen or narrow the focus
of a search by applying logic to your query. The most popular
logical terms are the operators AND, OR, and NOT. Modifiers
can be used with operators to further define your question.
These frequently-used words (AND, OR, and NOT) are interpreted
as Verity Query Language by default. You can focus the search
more closely by telling the search engine to retrieve documents
that contain the search terms in close proximity to each other:
that is, near each other or in a specified order. The operators
used for proximity searching are NEAR, NEAR/x, and the pair
ORDER NEAR.
DESCRIPTIONS
VALID SYNTAX
EXAMPLES
Boolean and Proximity Operators:
Note: all operators except
AND, OR, and NOT must be surrounded by "<" and ">"
symbols.
Find both terms
term1 <AND> term2
proton <AND> electron
Find one or both terms
term1 <OR> term2
smith <OR> jones
Find one or both terms (both scores higher)
term1 <ACCRUE> term2
smith <ACCRUE> jones
Find documents excluding a term
term1 <NOT> term2
<NOT> term
"lasers" <NOT> "excimer" <NOT>
superconductivity
Find terms in close proximity
term1 <NEAR> term2
air <NEAR> pollution
Find terms separated by x words
term1 <NEAR/x>
term2 (where x = # of words separating
terms)
optical <NEAR/3> systems
Find nearby terms in a given order
<ORDER> <NEAR> (term1term2)
<ORDER> <NEAR> ("thin film")
Wildcard
Characters [ Top ] Selects documents
that contain matches to a character string containing variables.
Wildcard characters let you define a search string with variables,
which can be used to locate related word matches in documents.
You can use the following wildcard characters to represent
variable portions of search strings.
DESCRIPTIONS
VALID SYNTAX
EXAMPLES
Wildcard Characters:
Specify one and only one character
(You can use a ? to specify the first letter of a word)
?
p?oton (finds proton, photon)
Specify zero or more characters
(You cannot use a * to specify the first letter of a word)