This file is indexed.

/usr/share/doc/cups/examples/printer.schema is in cups 1.5.2-9ubuntu1.

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The actual contents of the file can be viewed below.

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# Definitions for a schema to store CUPS printer information in LDAP
# OID Base is iso(1) org(3) dod(6) internet(1) private(4) enterprise(1) me(5323) cupsSchema(22)

# Syntaxes are under 1.3.6.1.4.1.5323.22.0
# Attributes are under 1.3.6.1.4.1.5323.22.1
# Object Classes are under 1.3.6.1.4.1.5323.22.2

attributetype ( 1.3.6.1.4.1.5323.22.1.1
	NAME 'printerDescription'
	DESC 'Description of Printer'
	EQUALITY caseExactIA5Match
	SINGLE-VALUE
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )

attributetype ( 1.3.6.1.4.1.5323.22.1.2
	NAME 'printerURI'
	DESC 'CUPS style URI for printer'
	EQUALITY caseExactIA5Match
	SINGLE-VALUE
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )

attributetype ( 1.3.6.1.4.1.5323.22.1.3
	NAME 'printerLocation'
	DESC 'Identifier string for Printer Location'
	EQUALITY caseExactIA5Match
	SINGLE-VALUE
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )

attributetype ( 1.3.6.1.4.1.5323.22.1.4
	NAME 'printerMakeAndModel'
	DESC 'String CUPS uses to figure out driver'
	EQUALITY caseExactIA5Match
	SINGLE-VALUE
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )

attributetype ( 1.3.6.1.4.1.5323.22.1.5
	NAME 'printerType'
	DESC 'Integer CUPS uses to figure out type'
	EQUALITY integerMatch
	SINGLE-VALUE
	SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 )

objectclass ( 1.3.6.1.4.1.5323.22.2.1
    NAME 'cupsPrinter'
	SUP top
	AUXILIARY
	MUST ( printerDescription $ printerURI $ printerLocation $ printerMakeAndModel $ printerType ) )