**Source URL:** https://limited.veevavault.dev/qualityone/mdl/documentation

# MDL Documentation

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

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