# Notes on Amazon Neptune Standards Compliance
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Amazon Neptune complies with applicable standards in implementing the Gremlin and SPARQL graph query languages in most cases.

These sections describe the standards as well as those areas where Neptune extends or diverges from them.

**Topics**
+ [Gremlin standards compliance in Amazon Neptune](access-graph-gremlin-differences.md)
+ [SPARQL standards compliance in Amazon Neptune](feature-sparql-compliance.md)
+ [openCypher specification compliance in Amazon Neptune](feature-opencypher-compliance.md)