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Use set for faster duplicate schema detection#87

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Open

Use set for faster duplicate schema detection#87
Stephen0512 wants to merge 1 commit intoSTIXProject:masterfrom
Stephen0512:master

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This PR improves schema deduplication performance by replacing a list with a set when tracking previously seen (targetNamespace, filename) pairs.

Since this seen list is only used for membership checks in the current method, using a set provides O(1) average-time lookups and better matches the intended usage, while preserving existing behavior.

The issue was identified during an ongoing research project.

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