Some Cyc results and output are available as XML files. The following XSDs describe the most commonly used Cyc XML outputs:
| Cyc Concepts | XML schema for Cyc concepts. | Download |
| Cyc ML | XML schema for CycL terms, including constants, formulas, assertions, etc. | Download |
| CycL Query | XML schema for CycL query specifications, including query sentence, microtheory, and inference parameters. | Download |
| Formula Template | XML schema for formula templates. Used for loading CycL query specifications from a Cyc image. | Download |
| Lightweight Result Set | XML schema for minimal result sets used for autocomplete and simple query results. | Download |
| Proof View | XML schema for proof-views, a natural-language justification format. | Download |
| Text Processing | XML schema for text processing results. | Download |