npm install xq-parser---
An extensible parser framework for everything in the XQuery / XPath family. With vendor-specific extensions. Implements both XQuery 3.1 and XQuery 4.
Based on the amazing Rex parser generator.
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| Vendor | Specification | Implementation state |
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| Exist-DB | XQuery Update extension | Implemented in both XQuery 3 and 4. Sponsored by Exist Solutions !Exist Solutions logo |
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| XQuery Update Facility | XQUF 30 | Not implemented. Open for sponsorhsip |
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| BaseX | XQuery Extensions | Not implemented. Open for sponsorhsip |
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| MarkLogic | MarkLogic Server Enhanced XQuery Language | Not implemented. Open for sponsorhsip |
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