Change tokenizer: add reserved Virtuoso function (sql:) to excluded p…

[ozq]

Issue: tokenizer dosen't consider sql: reserved function. (code: if (!state.prefixes[prefNs] && ["bif", "xsd"].indexOf(prefNs) < 0) { ... })

So, in the next sparql code: SELECT ?resourceUri ?cardTemplate_sp ?cardTemplate (sql:BEST_LANGMATCH(?_cardTemplate, 'ru; en; all', '') AS ?_cardTemplate) there will be syntax error, that sql prefix is not defined.

Solution: I've added sql prefix to excluded validation prefixes array: (code: if (!state.prefixes[prefNs] && ["bif", "xsd", "sql"].indexOf(prefNs) < 0) { ... })

Info about Virtuoso/PL functions and built-in SQL functions:

A SPARQL expression can contain calls to Virtuoso/PL functions and built-in SQL functions in both the WHERE clause and in the result set. Two namespace prefixes, bif and sql are reserved for these purposes. (http://docs.openlinksw.com/virtuoso/rdfsqlfromsparql/)

[LaurensRietveld]

Thanks, though I dislike vendor specific exceptions,this one is pretty small. I'll add it to yasgui this week. Will close the pr though and add your snippet myself through,as I'd like to keep all the dist files out of the Pr's as they'll result in merge conflicts

[LaurensRietveld]

This is added now to YASQE 2.11.14