HP IAP Version 2.0 User Guide (November 2008)

PDF documents

PDF documents are another case where the internal text representation can vary widely from the visible

presentation in PDF readers. Some issues that can arise:

• Text sequences can appear out of order on the same page d epending on how the page was

composed.

• Text can appear doubled or can have spacing inserted into or removed from the internal

repr esentation to assist some speciﬁcvisualpresentation.

In general, PDF d o cuments generated via print drivers are far more susceptible to these issues than PDF

documents generated directly using Acrobat and other such composing tools. However, because of the

nature of PDF itself, even they are not immune.

Boolean query expressions

You can combine words, fuzzy words, and word sequences using Boolean (logical) o perators AND, OR,

and NOT (these must be uppercase). The following table describes Boolean operators, where exp, exp1,

and exp2 represents a word, fuzzy word, word sequence, or other B oolean quer y expression.

Table 14 Boo

lean query expressions

Syntax

Matches

NOT exp

alternative syntax: - exp

alternative syntax: ! exp

all documents that do not m atch exp

exp1 OR exp

all documents that match either exp1 or exp2

exp1 AND exp2

alternative syntax: exp1 && exp2

alternative syntax: exp1exp2

all documents that match both exp1 and exp2

NOTE:

ThesecondalternativesyntaxforANDindicatesthatANDisthedefaultconnectiveinqueryexpressions.

You do not need to supply AND explicitly. It is assumed if n either AND nor OR is used explicitly. For

example, the query peace quiet is equivalent to the query peace AND quiet.

A NOT expression must be combined, using AND or OR, with another expression other than NOT.A

query cannot consist solely of ne gative criteria.

NOT quie

illegal

(NOT quiet) AND (NOT blue) illegal

NOTquietANDblue legal

NOT quiet OR nois*

legal

You must provide the proper number of arguments for a Boolean operator or an error message results:

oneargumentforNOT (- or !), two a rguments for AND (&& )andOR. For example, the following

queries result in an error message.

• alpha NOT:MissingargumentforNOT

• AND alpha: Missing argument for AND

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