The XML-Name SVG value specifies the name of the browsing context (tab, inline frame, object, etc.) for display of the linked content.
If a context with this name already exists, and can be securely accessed from this document, it is re-used, replacing the existing content. If it does not exist, it is created (the same as _blank, except that it now has a name). The name must be a valid XML Name, and should not start with an underscore (U+005F LOW LINE character), to meet the requirements of a valid browsing context name from HTML.