# Reference

Please refer to the following pages:

```{toctree}
:maxdepth: 1

schema
codelists
```

This profile makes use of the extensions below. Instead of declaring each extension in your OCDS packages, you can declare the consolidated OCDS for GPA extension:

```json
{
  "extensions": [
    "https://standard.open-contracting.org/profiles/gpa/latest/en/extension.json"
  ]
}
```

* [Additional Contact Points](https://extensions.open-contracting.org/en/extensions/ocds_additionalContactPoints/master/)
* [Award Criteria](https://extensions.open-contracting.org/en/extensions/awardCriteria/master/)
* [Bid Opening](https://extensions.open-contracting.org/en/extensions/ocds_bidOpening/master/)
* [Communication](https://extensions.open-contracting.org/en/extensions/ocds_communication/master/)
* [Covered By](https://extensions.open-contracting.org/en/extensions/ocds_coveredBy/master/)
* [Location](https://extensions.open-contracting.org/en/extensions/ocds_location/master/)
* [Options](https://extensions.open-contracting.org/en/extensions/ocds_options/master/)
* [Participation Fees](https://extensions.open-contracting.org/en/extensions/ocds_participationFee/master/)
* [Recurrence](https://extensions.open-contracting.org/en/extensions/ocds_recurrence/master/)
* [Second Stage Description](https://extensions.open-contracting.org/en/extensions/ocds_secondStageDescription/master/)
* [Selection Criteria](https://extensions.open-contracting.org/en/extensions/ocds_selectionCriteria/master/)
* [Techniques](https://extensions.open-contracting.org/en/extensions/ocds_techniques/master/)