# OPTIONAL FILTER

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## Abstract

OPTIONAL with inner and outer FILTERs

This page describes W3C SPARQL Working Group's SPARQL 1.0 test suite.

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## Test Descriptions

dawg-optional-filter-001: OPTIONAL-FILTER

  FILTER inside an OPTIONAL does not block an entire solution

  type
    mf:QueryEvaluationTest
  approval
  action
  result
    expr-1-result.ttl
dawg-optional-filter-002: OPTIONAL - Outer FILTER

  FILTER outside an OPTIONAL tests bound and unbound variables

  type
    mf:QueryEvaluationTest
  approval
  action
  result
    expr-2-result.ttl
dawg-optional-filter-003: OPTIONAL - Outer FILTER with BOUND

  Use !bound to only run outer FILTERs against variables bound in an OPTIONAL

  type
    mf:QueryEvaluationTest
  approval
  action
  result
    expr-3-result.ttl
dawg-optional-filter-004: OPTIONAL - Inner FILTER with negative EBV for outer variables

  FILTER inside an OPTIONAL does not corrupt the entire solution

  type
    mf:QueryEvaluationTest
  approval
  action
  result
    expr-4-result.ttl
dawg-optional-filter-005-not-simplified: dawg-optional-filter-005-not-simplified

  Double curly braces do NOT get simplified to single curly braces early on, before filters are scoped

  type
    mf:QueryEvaluationTest
  approval
  action
  result
    expr-5-result-not-simplified.ttl