# `<foreign>`

The `<foreign>` element allows the introduction of non-DITA content, for example, MathML, SVG, or Rich Text Format (RTF). The `<foreign>` element or a specialization may contain more than one type of non-DITA content or a mix of DITA and non-DITA content. Specialization of the `<foreign>` element generally is implemented as a domain, but architects looking for more control over the content may implement foreign vocabularies as structural specializations.

Category: Specialization elements