Dynamic resolution

Templates are looked up in the order of the configured namespaces, and the first existing file wins.

With the example configuration, the current site mysite and the site group mygroup, this resolves to the first existing file of:

1. templates/sites/mysite/header.twig
2. templates/groups/mygroup/header.twig
3. templates/_global/header.twig

{% include 'header.twig' %}

If none exists, Craft throws its usual TemplateNotFound exception.

Caution

Craft resolves existing template files first and consults the namespaces only afterwards. A namespace therefore never overrides a template that exists at the plain path.