# Query constructs supported by the Neptune DFE
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Currently, the Neptune DFE supports a subset of SPARQL and Gremlin query constructs.

For SPARQL, this is the subset of conjunctive [basic graph patterns](https://www.w3.org/TR/sparql11-query/#BasicGraphPatterns).

For Gremlin, it is generally the subset of queries that contain a chain of traversals which do not contain some of the more complex steps.

You can find out whether one of your queries is being executed in whole or in part by the DFE as follows:
+ In Gremlin, `explain` and `profile` results tell you what parts of a query are being executed by the DFE, if any. See [Information contained in a Gremlin `explain` report](gremlin-explain-api.md#gremlin-explain-api-results) for `explain` and [DFE `profile` reports](gremlin-profile-api.md#gremlin-profile-dfe-output) for `profile`. Also, see [Tuning Gremlin queries using `explain` and `profile`](gremlin-traversal-tuning.md).

  Details about Neptune engine support for individual Gremlin steps are documented in [Gremlin step support](gremlin-step-support.md).
+ Similarly, SPARQL `explain` tells you whether a SPARQL query is being executed by the DFE. See [Example of SPARQL `explain` output when the DFE is enabled](sparql-explain-examples.md#sparql-explain-output-dfe) and [`DFENode` operator](sparql-explain-operators.md#sparql-explain-operator-dfenode) for more details.