# Developer Guide

[](https://help.qlik.com/talend/en-US/talend-data-catalog/Content/developer-guide/index.htm)

## Overview

Information note

**Important Disclaimer**   
Note that some of the features detailed in this document may not apply and/or be available for the particular edition/version you are using.

This Talend Data Catalog (TDC) Developer Guide includes the documentation on:

* The Metadata Query Language (MQL) which is used in both the UI (Search and Worksheets) and the REST API. This includes the description of the available attributes.

* The REST API calls are documented with Swagger, and are available:

  * [Read only REST API swagger documentation](https://docs.metakarta.com/rest-api/)
  * Live within the Talend Data Catalog (TDC) Web Application Server (For security reasons, this feature must be [manually enabled by the Administrator](https://help.qlik.com/talend/en-US/talend-data-catalog/8.1/Content/deployment-guide/rest-api-documentation-setup/index.htm)

* The Semantic Hub Language (SHL)