**Source URL:** https://general.veevavault.dev/mdl/documentation.md

# MDL Documentation

This section contains guides and introductory material for MDL (Metadata Definition Language).

<LandingPageList>

* [Access Control](/mdl/documentation/common-uses/access-control/)
* [About Vault Components](/mdl/documentation/explanations/about-vault-components/)
* [Querying Components](/mdl/documentation/guides/querying-components/)
* [Command Syntax](/mdl/documentation/mdl-commands/command-syntax/)
* [Logical Operators](/mdl/documentation/mdl-operators/logical-operators/)
* [MDL Overview](/mdl/documentation/overview/)
* [Attribute Data Types](/mdl/documentation/references/attribute-data-types/)
* [Alter Multiple Components](/mdl/documentation/common-uses/alter-multiple-components/)
* [About XML String Configuration](/mdl/documentation/explanations/about-xml-string-configuration/)
* [Creating Web Sections](/mdl/documentation/guides/creating-web-sections/)
* [CREATE](/mdl/documentation/mdl-commands/create/)
* [IF EXISTS](/mdl/documentation/mdl-operators/if-exists/)
* [Errors](/mdl/documentation/references/errors/)
* [Convert Long Text to Rich Text](/mdl/documentation/common-uses/convert-long-text/)
* [Using Vault Toolbox to Execute MDL](/mdl/documentation/guides/vault-toolbox/)
* [RECREATE](/mdl/documentation/mdl-commands/recreate/)
* [IF NOT EXISTS](/mdl/documentation/mdl-operators/if-not-exists/)
* [Security](/mdl/documentation/references/security/)
* [Migrate Component Configuration](/mdl/documentation/common-uses/migrate-component-configuration/)
* [RENAME](/mdl/documentation/mdl-commands/rename/)
* [DROP](/mdl/documentation/mdl-commands/drop/)
* [ALTER](/mdl/documentation/mdl-commands/alter/)

</LandingPageList>