sparql - Why did TopBraid Composer FE re-group my multiple OR conditions in a SPIN rule filter? -

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i'm using topbraid composer free edition (tbc fe) version 5.1.3. i'm building spin rules / construct queries. part of query has filter statement multiple or'd conditions. enter tbc fe follows:

filter (  (?orgstring = substr("af  x"^^xsd:string, 1, 4)) ||  (?orgstring = substr("j   x"^^xsd:string, 1, 4)) ||   (?orgstring = substr("ar  x"^^xsd:string, 1, 4)) ||   (?orgstring = substr("n   x"^^xsd:string, 1, 4)) ||   (?orgstring = substr("ns  x"^^xsd:string, 1, 4)) ||   (?orgstring = substr("mc  x"^^xsd:string, 1, 4)) ) .

but, when save spin rule in tbc fe, regroups or'd conditions set of binary or's:

filter ( (((((?orgstring = substr("af  x"^^xsd:string, 1, 4))  ||      (?orgstring = substr("j   x"^^xsd:string, 1, 4))) ||     (?orgstring = substr("ar  x"^^xsd:string, 1, 4))) ||     (?orgstring = substr("n   x"^^xsd:string, 1, 4))) ||     (?orgstring = substr("ns  x"^^xsd:string, 1, 4))) ||     (?orgstring = substr("mc  x"^^xsd:string, 1, 4)) ) .

my question is: why regrouping? i've used other sparql editors , end points did not regrouping. contend makes code harder read (cost), i'm wondering benefit is?

also, if regrouping not necessary, there way turn off in tbc fe?

thanks.

ps: yes, know taking substring of literal string seems stupid. i'm doing avoid bug in sesame trims literal strings when load rdf file save tbd fe sesame. bug has been reported , being addressed. when it's fixed, i'll upgrade sesame version , remove these ugly substrings.

it's way jena print queries, not aspect of tbc fe. binary operator left associative parser creates expression tree (( e1 op e2 ) op e3 ) , printed that. simple , safe; printing expressions not take precedence account.

an alternative way write filter 

?orgstring in ( substr("af  x", 1, 4), substr("j   x", 1, 4), ...)

in case help.


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