Add recursive descent XQuery parser (opt-in via feature flag)#6220

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joewiz wants to merge 9 commits intoeXist-db:developfrom

joewiz:v2/new-parser

Commits on Apr 24, 2026

[feature] Add recursive descent XQuery parser with feature flag

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[feature] Add XQuery 4.0 version gating to recursive descent parser

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[test] Verify rd parser correctness and fix XQUF keyword conflicts

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[test] Remove duplicate orderby-empty-ordering-spec tests

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[feature] RD parser parity: XQ4 axes, string templates, destructuring let, arrow blocks, try-catch

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[feature] RD parser parity: ternary, filter AM, record type

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[feature] RD parser parity: boolean switch, gnode, braced switch/typeswitch

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[feature] RD parser parity: string literal lookup key

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[bugfix] RD parser: fix keyword argument placeholders in partial application

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