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This is an alphabetical list of XPath functions (fn) and operators (op). Implemented functions are put in bold. 

Functions and operators in alphabetical order

• op:NOTATION-equal($arg1 as xs:NOTATION, $arg2 as xs:NOTATION) as xs:boolean
• fn:QName($paramURI as xs:string?, $paramQName as xs:string) as xs:QName
• op:QName-equal($arg1 as xs:QName, $arg2 as xs:QName) as xs:boolean
• fn:abs($arg as numeric?) as numeric?
• op:add-dayTimeDuration-to-date($arg1 as xs:date, $arg2 as xs:dayTimeDuration) as xs:date
• op:add-dayTimeDuration-to-dateTime($arg1 as xs:dateTime, $arg2 as xs:dayTimeDuration) as xs:dateTime
• op:add-dayTimeDuration-to-time($arg1 as xs:time, $arg2 as xs:dayTimeDuration) as xs:time
• op:add-dayTimeDurations($arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration) as xs:dayTimeDuration
• op:add-yearMonthDuration-to-date($arg1 as xs:date, $arg2 as xs:yearMonthDuration) as xs:date
• op:add-yearMonthDuration-to-dateTime($arg1 as xs:dateTime, $arg2 as xs:yearMonthDuration) as xs:dateTime
• op:add-yearMonthDurations($arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration) as xs:yearMonthDuration
• fn:adjust-date-to-timezone($arg as xs:date?) as xs:date?
• fn:adjust-date-to-timezone($arg as xs:date?, $timezone as xs:dayTimeDuration?) as xs:date?
• fn:adjust-dateTime-to-timezone($arg as xs:dateTime?) as xs:dateTime?
• fn:adjust-dateTime-to-timezone($arg as xs:dateTime?, $timezone as xs:dayTimeDuration?) as xs:dateTime?
• fn:adjust-time-to-timezone($arg as xs:time?) as xs:time?
• fn:adjust-time-to-timezone($arg as xs:time?, $timezone as xs:dayTimeDuration?) as xs:time?
• fn:avg($arg as xs:anyAtomicType) as xs:anyAtomicType?*
• fn:base-uri() as xs:anyURI?
• fn:base-uri($arg as node()?) as xs:anyURI?
• op:base64Binary-equal($value1 as xs:base64Binary, $value2 as xs:base64Binary) as xs:boolean
• fn:boolean($arg as item()*) as xs:boolean
• op:boolean-equal($value1 as xs:boolean, $value2 as xs:boolean) as xs:boolean
• op:boolean-greater-than($arg1 as xs:boolean, $arg2 as xs:boolean) as xs:boolean
• op:boolean-less-than($arg1 as xs:boolean, $arg2 as xs:boolean) as xs:boolean
• fn:ceiling($arg as numeric?) as numeric?
• fn:codepoint-equal($comparand1 as xs:string?, $comparand2 as xs:string?) as xs:boolean?
• fn:codepoints-to-string($arg as xs:integer) as xs:string*
• fn:collection() as node()*
• fn:collection($arg as xs:string?) as node()*
• fn:compare($comparand1 as xs:string?, $comparand2 as xs:string?) as xs:integer?
• fn:compare($comparand1 as xs:string?, $comparand2 as xs:string?, $collation as xs:string) as xs:integer?
• fn:concat($arg1 as xs:anyAtomicType?, $arg2 as xs:anyAtomicType?, …) as xs:string
• op:concatenate($seq1 as item(), $seq2 as item()) as item()*
• fn:contains($arg1 as xs:string?, $arg2 as xs:string?) as xs:boolean
• fn:contains($arg1 as xs:string?, $arg2 as xs:string?, $collation as xs:string) as xs:boolean
• fn:count($arg as item()*) as xs:integer
• fn:current-date() as xs:date
• fn:current-dateTime() as xs:dateTime
• fn:current-time() as xs:time
• fn:data($arg as item()) as xs:anyAtomicType
• op:date-equal($arg1 as xs:date, $arg2 as xs:date) as xs:boolean
• op:date-greater-than($arg1 as xs:date, $arg2 as xs:date) as xs:boolean
• op:date-less-than($arg1 as xs:date, $arg2 as xs:date) as xs:boolean
• fn:dateTime($arg1 as xs:date?, $arg2 as xs:time?) as xs:dateTime?
• op:dateTime-equal($arg1 as xs:dateTime, $arg2 as xs:dateTime) as xs:boolean
• op:dateTime-greater-than($arg1 as xs:dateTime, $arg2 as xs:dateTime) as xs:boolean
• op:dateTime-less-than($arg1 as xs:dateTime, $arg2 as xs:dateTime) as xs:boolean
• fn:day-from-date($arg as xs:date?) as xs:integer?
• fn:day-from-dateTime($arg as xs:dateTime?) as xs:integer?
• op:dayTimeDuration-greater-than($arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration) as xs:boolean
• op:dayTimeDuration-less-than($arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration) as xs:boolean
• fn:days-from-duration($arg as xs:duration?) as xs:integer?
• fn:deep-equal($parameter1 as item(), $parameter2 as item()) as xs:boolean
• fn:deep-equal($parameter1 as item(), $parameter2 as item(), $collation as string) as xs:boolean
• fn:default-collation() as xs:string
• fn:distinct-values($arg as xs:anyAtomicType) as xs:anyAtomicType**
• fn:distinct-values($arg as xs:anyAtomicType*, $collation as xs:string) as xs:anyAtomicType*
• op:divide-dayTimeDuration($arg1 as xs:dayTimeDuration, $arg2 as xs:double) as xs:dayTimeDuration
• op:divide-dayTimeDuration-by-dayTimeDuration($arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration) as xs:decimal
• op:divide-yearMonthDuration($arg1 as xs:yearMonthDuration, $arg2 as xs:double) as xs:yearMonthDuration
• op:divide-yearMonthDuration-by-yearMonthDuration($arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration) as xs:decimal
• fn:doc($uri as xs:string?) as document-node()?
• fn:doc-available($uri as xs:string?) as xs:boolean
• fn:document-uri($arg as node()?) as xs:anyURI?
• op:duration-equal($arg1 as xs:duration, $arg2 as xs:duration) as xs:boolean
• fn:element-with-id($arg as xs:string*) as element()*
• fn:element-with-id($arg as xs:string*, $node as node()) as element()*
• fn:empty($arg as item()*) as xs:boolean
• fn:encode-for-uri($uri-part as xs:string?) as xs:string
• fn:ends-with($arg1 as xs:string?, $arg2 as xs:string?) as xs:boolean
• fn:ends-with($arg1 as xs:string?, $arg2 as xs:string?, $collation as xs:string) as xs:boolean
• fn:error() as none
• fn:error($error as xs:QName) as none
• fn:error($error as xs:QName?, $description as xs:string) as none
• fn:error($error as xs:QName?, $description as xs:string, $error-object as item()*) as none
• fn:escape-html-uri($uri as xs:string?) as xs:string
• fn:exactly-one($arg as item()*) as item()
• op:except($parameter1 as node(), $parameter2 as node()) as node()*
• fn:exists($arg as item()*) as xs:boolean
• fn:false() as xs:boolean
• fn:floor($arg as numeric?) as numeric?
• op:gDay-equal($arg1 as xs:gDay, $arg2 as xs:gDay) as xs:boolean
• op:gMonth-equal($arg1 as xs:gMonth, $arg2 as xs:gMonth) as xs:boolean
• op:gMonthDay-equal($arg1 as xs:gMonthDay, $arg2 as xs:gMonthDay) as xs:boolean
• op:gYear-equal($arg1 as xs:gYear, $arg2 as xs:gYear) as xs:boolean
• op:gYearMonth-equal($arg1 as xs:gYearMonth, $arg2 as xs:gYearMonth) as xs:boolean
• op:hexBinary-equal($value1 as xs:hexBinary, $value2 as xs:hexBinary) as xs:boolean
• fn:hours-from-dateTime($arg as xs:dateTime?) as xs:integer?
• fn:hours-from-duration($arg as xs:duration?) as xs:integer?
• fn:hours-from-time($arg as xs:time?) as xs:integer?
• fn:id($arg as xs:string*) as element()*
• fn:id($arg as xs:string*, $node as node()) as element()*
• fn:idref($arg as xs:string*) as node()*
• fn:idref($arg as xs:string*, $node as node()) as node()*
• fn:implicit-timezone() as xs:dayTimeDuration
• fn:in-scope-prefixes($element as element()) as xs:string*
• fn:index-of($seqParam as xs:anyAtomicType, $srchParam as xs:anyAtomicType) as xs:integer**
• fn:index-of($seqParam as xs:anyAtomicType*, $srchParam as xs:anyAtomicType, $collation as xs:string) as xs:integer*
• fn:insert-before($target as item(), $position as xs:integer, $inserts as item()) as item()*
• op:intersect($parameter1 as node(), $parameter2 as node()) as node()*
• fn:iri-to-uri($iri as xs:string?) as xs:string
• op:is-same-node($parameter1 as node(), $parameter2 as node()) as xs:boolean
• fn:lang($testlang as xs:string?) as xs:boolean
• fn:lang($testlang as xs:string?, $node as node()) as xs:boolean
• fn:last() as xs:integer
• fn:local-name() as xs:string
• fn:local-name($arg as node()?) as xs:string
• fn:local-name-from-QName($arg as xs:QName?) as xs:NCName?
• fn:lower-case($arg as xs:string?) as xs:string
• fn:matches($input as xs:string?, $pattern as xs:string) as xs:boolean
• fn:matches($input as xs:string?, $pattern as xs:string, $flags as xs:string) as xs:boolean
• fn:max($arg as xs:anyAtomicType) as xs:anyAtomicType?*
• fn:max($arg as xs:anyAtomicType*, $collation as string) as xs:anyAtomicType?
• fn:min($arg as xs:anyAtomicType) as xs:anyAtomicType?*
• fn:min($arg as xs:anyAtomicType*, $collation as string) as xs:anyAtomicType?
• fn:minutes-from-dateTime($arg as xs:dateTime?) as xs:integer?
• fn:minutes-from-duration($arg as xs:duration?) as xs:integer?
• fn:minutes-from-time($arg as xs:time?) as xs:integer?
• fn:month-from-date($arg as xs:date?) as xs:integer?
• fn:month-from-dateTime($arg as xs:dateTime?) as xs:integer?
• fn:months-from-duration($arg as xs:duration?) as xs:integer?
• op:multiply-dayTimeDuration($arg1 as xs:dayTimeDuration, $arg2 as xs:double) as xs:dayTimeDuration
• op:multiply-yearMonthDuration($arg1 as xs:yearMonthDuration, $arg2 as xs:double) as xs:yearMonthDuration
• fn:name() as xs:string
• fn:name($arg as node()?) as xs:string
• fn:namespace-uri() as xs:anyURI
• fn:namespace-uri($arg as node()?) as xs:anyURI
• fn:namespace-uri-for-prefix($prefix as xs:string?, $element as element()) as xs:anyURI?
• fn:namespace-uri-from-QName($arg as xs:QName?) as xs:anyURI?
• fn:nilled($arg as node()?) as xs:boolean?
• op:node-after($parameter1 as node(), $parameter2 as node()) as xs:boolean
• op:node-before($parameter1 as node(), $parameter2 as node()) as xs:boolean
• fn:node-name($arg as node()?) as xs:QName?
• fn:normalize-space() as xs:string
• fn:normalize-space($arg as xs:string?) as xs:string
• fn:normalize-unicode($arg as xs:string?) as xs:string
• fn:normalize-unicode($arg as xs:string?, $normalizationForm as xs:string) as xs:string
• fn:not($arg as item()*) as xs:boolean
• fn:number() as xs:double
• fn:number($arg as xs:anyAtomicType?) as xs:double
• op:numeric-add($arg1 as numeric, $arg2 as numeric) as numeric
• op:numeric-divide($arg1 as numeric, $arg2 as numeric) as numeric
• op:numeric-equal($arg1 as numeric, $arg2 as numeric) as xs:boolean
• op:numeric-greater-than($arg1 as numeric, $arg2 as numeric) as xs:boolean
• op:numeric-integer-divide($arg1 as numeric, $arg2 as numeric) as xs:integer
• op:numeric-less-than($arg1 as numeric, $arg2 as numeric) as xs:boolean
• op:numeric-mod($arg1 as numeric, $arg2 as numeric) as numeric
• op:numeric-multiply($arg1 as numeric, $arg2 as numeric) as numeric
• op:numeric-subtract($arg1 as numeric, $arg2 as numeric) as numeric
• op:numeric-unary-minus($arg as numeric) as numeric
• op:numeric-unary-plus($arg as numeric) as numeric
• fn:one-or-more($arg as item()*) as item()+
• fn:position() as xs:integer
• fn:prefix-from-QName($arg as xs:QName?) as xs:NCName?
• fn:remove($target as item(), $position as xs:integer) as item()
• fn:replace($input as xs:string?, $pattern as xs:string, $replacement as xs:string) as xs:string
• fn:replace($input as xs:string?, $pattern as xs:string, $replacement as xs:string, $flags as xs:string) as xs:string
• fn:resolve-QName($qname as xs:string?, $element as element()) as xs:QName?
• fn:resolve-uri($relative as xs:string?) as xs:anyURI?
• fn:resolve-uri($relative as xs:string?, $base as xs:string) as xs:anyURI?
• fn:reverse($arg as item()) as item()
• fn:root() as node()
• fn:root($arg as node()?) as node()?
• fn:round($arg as numeric?) as numeric?
• fn:round-half-to-even($arg as numeric?) as numeric?
• fn:round-half-to-even($arg as numeric?, $precision as xs:integer) as numeric?
• fn:seconds-from-dateTime($arg as xs:dateTime?) as xs:decimal?
• fn:seconds-from-duration($arg as xs:duration?) as xs:decimal?
• fn:seconds-from-time($arg as xs:time?) as xs:decimal?
• fn:starts-with($arg1 as xs:string?, $arg2 as xs:string?) as xs:boolean
• fn:starts-with($arg1 as xs:string?, $arg2 as xs:string?, $collation as xs:string) as xs:boolean
• fn:static-base-uri() as xs:anyURI?
• fn:string() as xs:string
• fn:string($arg as item()?) as xs:string
• fn:string-join($arg1 as xs:string, $arg2 as xs:string) as xs:string*
• fn:string-length() as xs:integer
• fn:string-length($arg as xs:string?) as xs:integer
• fn:string-to-codepoints($arg as xs:string?) as xs:integer*
• fn:subsequence($sourceSeq as item(), $startingLoc as xs:double) as item()
• fn:subsequence($sourceSeq as item(), $startingLoc as xs:double, $length as xs:double) as item()
• fn:substring($sourceString as xs:string?, $startingLoc as xs:double) as xs:string
• fn:substring($sourceString as xs:string?, $startingLoc as xs:double, $length as xs:double) as xs:string
• fn:substring-after($arg1 as xs:string?, $arg2 as xs:string?) as xs:string
• fn:substring-after($arg1 as xs:string?, $arg2 as xs:string?, $collation as xs:string) as xs:string
• fn:substring-before($arg1 as xs:string?, $arg2 as xs:string?) as xs:string
• fn:substring-before($arg1 as xs:string?, $arg2 as xs:string?, $collation as xs:string) as xs:string
• op:subtract-dateTimes($arg1 as xs:dateTime, $arg2 as xs:dateTime) as xs:dayTimeDuration
• op:subtract-dates($arg1 as xs:date, $arg2 as xs:date) as xs:dayTimeDuration
• op:subtract-dayTimeDuration-from-date($arg1 as xs:date, $arg2 as xs:dayTimeDuration) as xs:date
• op:subtract-dayTimeDuration-from-dateTime($arg1 as xs:dateTime, $arg2 as xs:dayTimeDuration) as xs:dateTime
• op:subtract-dayTimeDuration-from-time($arg1 as xs:time, $arg2 as xs:dayTimeDuration) as xs:time
• op:subtract-dayTimeDurations($arg1 as xs:dayTimeDuration, $arg2 as xs:dayTimeDuration) as xs:dayTimeDuration
• op:subtract-times($arg1 as xs:time, $arg2 as xs:time) as xs:dayTimeDuration
• op:subtract-yearMonthDuration-from-date($arg1 as xs:date, $arg2 as xs:yearMonthDuration) as xs:date
• op:subtract-yearMonthDuration-from-dateTime($arg1 as xs:dateTime, $arg2 as xs:yearMonthDuration) as xs:dateTime
• op:subtract-yearMonthDurations($arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration) as xs:yearMonthDuration
• fn:sum($arg as xs:anyAtomicType) as xs:anyAtomicType*
• fn:sum($arg as xs:anyAtomicType*, $zero as xs:anyAtomicType?) as xs:anyAtomicType?
• op:time-equal($arg1 as xs:time, $arg2 as xs:time) as xs:boolean
• op:time-greater-than($arg1 as xs:time, $arg2 as xs:time) as xs:boolean
• op:time-less-than($arg1 as xs:time, $arg2 as xs:time) as xs:boolean
• fn:timezone-from-date($arg as xs:date?) as xs:dayTimeDuration?
• fn:timezone-from-dateTime($arg as xs:dateTime?) as xs:dayTimeDuration?
• fn:timezone-from-time($arg as xs:time?) as xs:dayTimeDuration?
• op:to($firstval as xs:integer, $lastval as xs:integer) as xs:integer*
• fn:tokenize($input as xs:string?, $pattern as xs:string) as xs:string*
• fn:tokenize($input as xs:string?, $pattern as xs:string, $flags as xs:string) as xs:string*
• fn:trace($value as item(), $label as xs:string) as item()
• fn:translate($arg as xs:string?, $mapString as xs:string, $transString as xs:string) as xs:string
• fn:true() as xs:boolean
• op:union($parameter1 as node(), $parameter2 as node()) as node()*
• fn:unordered($sourceSeq as item()) as item() (recognized but ignored)
• fn:upper-case($arg as xs:string?) as xs:string
• fn:year-from-date($arg as xs:date?) as xs:integer?
• fn:year-from-dateTime($arg as xs:dateTime?) as xs:integer?
• op:yearMonthDuration-greater-than($arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration) as xs:boolean
• op:yearMonthDuration-less-than($arg1 as xs:yearMonthDuration, $arg2 as xs:yearMonthDuration) as xs:boolean
• fn:years-from-duration($arg as xs:duration?) as xs:integer?
• fn:zero-or-one($arg as item()*) as item()?
• xs:boolean
• xs:decimal (returns xs:double)
• xs:double
• xs:float (returns xs:double)
• xs:integer (returns xs:long)
• xs:long
• xs:int (returns xs:long)
• xs:short (returns xs:long)
• xs:byte (returns xs:long)
• xs:string
• xs:dateTime
• xs:date
• xs:time
• xs:gYear
• xs:gYearMonth
• xs:gMonth
• xs:gMonthDay
• xs:gDay
• xs:duration
• xs:yearMonthDuration
• xs:dayTimeDuration

Not implemented / supported

• schema-element / schema-attribute / treat as
• element / attribute test using type name
• numbers are treated as either xs:double or xs:long. (xs:decimal, xs:integer, xs:float, xs:short, xs:int, etc. not distinguished)