ARQ supports the functions and operators from “XQuery 1.0 and XPath 2.0 Functions and Operators v3.1”.
ARQ supports all the XSD atomic datatypes.
The prefix fn is <http://www.w3.org/2005/xpath-functions#> (the XPath and XQuery function namespace).
The prefix math is <http://www.w3.org/2005/xpath-functions/math#>
To check the exact registrations for a specific version, see function/StandardFunctions.java in the source code for that version.
The supported datatypes (including those required by SPARQL 1.1), including full operator support, are the XSD atomic datatypes except for XML-related ones. Sequences are not supported.
xsd:string, xsd:boolean, xsd:decimal, xsd:integer, xsd:double, xsd:float, xsd:double
xsd:long, xsd:int, xsd:short, xsd:byte, xsd:nonPositiveInteger, xsd:negativeInteger, xsd:nonNegativeInteger, xsd:positiveInteger, xsd:unsignedLong, xsd:unsignedInt, xsd:unsignedShort
xsd:duration, xsd:dayTimeDuration, xsd:yearMonthDuration
xsd:anyURI
xsd:dateTime, xsd:dateTimeStamp, xsd:date, xsd:time xsd:gYear, xsd:gYearMonth, xsd:gMonth, xsd:gMonthDay, xsd:gDay
Functions on atomic types not currently supported are list below (but check for later additions).
Supported functions:
fn:concat, fn:substring, fn:string-length, fn:upper-case, fn:lower-case, fn:contains, fn:starts-with, fn:ends-with, fn:substring-before, fn:substring-after, fn:matches, fn:replace, fn:abs, fn:ceiling, fn:floor, fn:round, fn:encode-for-uri,
fn:year-from-dateTime, fn:month-from-dateTime, fn:day-from-dateTime, fn:hours-from-dateTime, fn:minutes-from-dateTime, fn:seconds-from-dateTime, fn:timezone-from-dateTime, fn:years-from-duration, fn:months-from-duration, fn:days-from-duration, fn:hours-from-duration, fn:minutes-from-duration, fn:seconds-from-duration,
fn:boolean, fn:not, fn:normalize-space, fn:normalize-unicode, fn:format-number, fn:round-half-to-even,
math:pi, math:exp, math:exp10, math:log, math:log10, math:pow, math:sqrt, math:sin, math:cos, math:tan, math:asin, math:acos, math:atan, math:atan2
fn:format-dateTime, fn:format-date, fn:format-time.