| Relevant from the xml spec:
The _expression_ fn:substring("12345", 0, 3) returns "12". (Characters at positions greater than or equal to 0 and less than 3 are selected. Since the first position is 1, these are the characters at positions 1 and 2.)
So it’s perfectly legal to do substring(“a”, -9999, 9999), which returns “a”.
Håvard
Good find Jerven.
You might also file a bug with Jena for the 0, 1 edge case. I only glanced at the spec but it seems to me that in that case the answer should still be "A", not the empty string.
Cheers,
Jeen Hi James, All,
I didn't see an example with startingLoc less than 1.
However, one document down in the xpath-functions one there is clarity.
https://www.w3.org/TR/xpath-functions/#func-substring
And I should have looked at that first.
I think this means edge case non conformance bugs in rdf4j and virtuoso.
I will propose a fix for it in rdf4j and file a bug for it for virtuoso.
i.e. SUBSTR("ABC", 0, 2)
should return "A" because only for position 1
does fn:round(0) <= 1 and 1 < fn:round(0) + fn:round(2) hold
Regards,
Jerven
On 2019-03-24 17:38, james anderson wrote:
>> On 2019-03-24, at 15:34:55, Jerven Tjalling Bolleman
>> <jerven.bolleman@sib.swiss> wrote:
>>
>> Hi All,
>>
>> Cross posting as this seems to be a question of spec implementation
>> and I am not sure what the correct answer is supposed to be.
>
> look at the examples in the document which you referenced.
>
> best regards, from berlin,
> ---
> james anderson | james@xxxxxxxxx | http://dydra.com
--
Jerven Tjalling Bolleman
SIB | Swiss Institute of Bioinformatics
CMU - 1, rue Michel Servet - 1211 Geneva 4
t: +41 22 379 58 85 - f: +41 22 379 58 58
Jerven.Bolleman@sib.swiss - http://www.sib.swiss
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