[JENA-2189] some XPath registry and function names are wrong

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Jena 3.8.0, Jena 3.9.0, Jena 3.10.0, Jena 3.11.0, Jena 3.12.0, Jena 3.13.0, Jena 3.13.1, Jena 3.14.0, Jena 3.15.0, Jena 3.16.0, Jena 3.17.0, Jena 4.0.0, Jena 4.1.0, Jena 4.2.0
• Fix Version/s: Jena 4.3.0
• Component/s: Jena
• Assignee: Andy Seaborne
• Reporter: Peter Winstanley
• Created: 01/Nov/21 13:49
• Updated: 09/Dec/21 10:21
• Resolved: 05/Nov/21 14:47

Description

I came across this when trying out some code on jena 4.2 on the tarql project 
 
[main] WARN org.apache.jena.arq.exec - URI <http://www.w3.org/2005/xpath-functions#day-from-dateTime> has no registered function factory
 
I looked at https://github.com/apache/jena/blob/main/jena-arq/src/main/java/org/apache/jena/sparql/function/StandardFunctions.java and realised that a few functions aren't what they are described as in https://www.w3.org/TR/xpath-functions-3/ .  They appear to have a signature that uses the plural, whereas the XPath functions are singular:
 
        add(registry, xfn+"years-from-date",        FN_YearsFromDate.class) ;                                                            https://www.w3.org/TR/xpath-functions-3/#func-year-from-date
        add(registry, xfn+"months-from-date",       FN_MonthsFromDate.class) ;                                                       https://www.w3.org/TR/xpath-functions-3/#func-month-from-date
        add(registry, xfn+"days-from-date",         FN_DaysFromDate.class) ;                                                             https://www.w3.org/TR/xpath-functions-3/#func-day-from-date
 
 
        add(registry, xfn+"years-from-dateTime",    FN_YearsFromDateTime.class) ;                                                https://www.w3.org/TR/xpath-functions-31/#func-year-from-dateTime
        add(registry, xfn+"months-from-dateTime",   FN_MonthsFromDateTime.class) ;                                           https://www.w3.org/TR/xpath-functions-3/#func-month-from-dateTime
        add(registry, xfn+"days-from-dateTime",     FN_DaysFromDateTime.class) ;                                                 https://www.w3.org/TR/xpath-functions-3/#func-day-from-dateTime
 
 
 
 
When I used the incorrect XPath function signature "days-from-dateTime()" the result was calculated as expected and there was no warning error message as above.
 
When using the distribution of Tarql 1.2 (which, afaik, used Jena 3.11) I only got the following error:
WARN  URI <http://www.w3.org/2005/xpath-functions#days-from-dateTime> has no registered function factory
and using "day-from-dateTime()" worked correctly.  I looked into this by opening the jar and found that the function was correct there:
 
;org/apache/jena/sparql/function/library/FN_YearFromDateTime month-from-dateTime <org/apache/jena/sparql/function/library/FN_MonthFromDateTime day-from-dateTime :org/apache/jena/sparql/function/library/FN_DayFromDateTime
 
 
So, it looks like a long-standing error that has been corrected at some point in the generation of the jars for the distro of Tarql 1.2
 

Issue Links

• links to: GitHub Pull Request #1102