Case insensitive relation check, fixes #17

[adamdickmeiss]

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[Copilot]

Pull request overview

This PR implements case-insensitive relation checking in the CQL parser to fix issue #17. The parser now accepts relation keywords (such as "any", "all", "within", etc.) in any case combination while preserving the original casing in the parsed output.

Key changes:

• Modified the isRelation() method to use equalsIgnoreCase() for all relation keyword checks
• Updated custom relation matching to use case-insensitive comparison via stream API
• Updated test fixtures to verify case-insensitive parsing behavior with capitalized relation keywords

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/main/java/org/z3950/zing/cql/CQLParser.java	Refactored isRelation() and isSymbolicRelation() methods to use case-insensitive comparisons and improved code formatting
src/test/resources/regression/09/06.cql	Updated test input to use "Sortby" instead of "sortby" to verify case-insensitive parsing
src/test/resources/regression/09/06.xcql	Updated expected output to reflect "Sortby" with capital S
src/test/resources/regression/02/03.cql	Updated test input to use "Any" instead of "any" to verify case-insensitive relation parsing
src/test/resources/regression/02/03.xcql	Updated expected output to reflect "Any" with capital A

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