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This page describes W3C SPARQL Working Group's SPARQL1.0 test suite.
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Nested-optionals with a shared variable that does not appear in the middle pattern (a not well-formed query pattern as per "Semantics and Complexity" of SPARQL
OPTIONALs parse in a left-associative manner
A FILTER inside an OPTIONAL can reference a variable bound in the required part of the OPTIONAL
FILTERs inside an OPTIONAL can refer to variables from both the required and optional parts of the construct.
FILTERs in an OPTIONAL do not extend to variables bound outside of the LeftJoin(...) operation
FILTER placed after the triple pattern that contains the variable tested
FILTERs are scoped to the nearest enclosing group - placement within that group does not matter
FILTERs are scoped to the nearest enclosing group - placement within that group does not matter
A FILTER is in scope for variables bound at the same level of the query tree
A FILTER in a group { ... } cannot see variables bound outside that group
FILTERs in an OPTIONAL do not extend to variables bound outside of the LeftJoin(...) operation
Variables have query scope.
Tests nested combination of Join with a BGP / OPT and a BGP / UNION
Tests combination of Join operator with Graph on LHS and Union on RHS