The <containers> section is used to define all the elements in the target doctype that should be considered as containers. All the text nodes under a container will form a single amalgamation in Arboreal. A container is restricted to a single language; the subcontainer mechanism allows for language embedding.
Under <containers>, any number of <element> nodes are allowed. An <element> node is empty and has the single required attribute name.
Example 1: To define the element <s> as a container, use: