Setting

Use the Setting tag to get site settings.

Pass the name of the setting as the first attribute.

<Setting admin_email />

See this page for a reference of all site settings in WordPress core.

Field

If the setting's value is an array or associative array, use the field attribute to get a property from it.

<Setting custom_setting field=id />

We plan to extend this feature to support getting values deeper in an array/object.