A URI reference (or an IRI) reference specifying the location of the resource to include. (See W3C XInclude documentation (http://www.w3.org/TR/xinclude/.)
This element is only used for <xi:include>; most elements in this Tag Set use the XLink href attribute (@xlink:href).
According to the W3C documentation:
The href attribute is optional; the absence of this attribute is the same as specifying href='', that is, the reference is to the same document. If the href attribute is absent when parse="xml", the @xpointer attribute must be present. Fragment identifiers must not be used; their appearance is a fatal error.
| Value | Meaning |
|---|---|
| Text, numbers, or special characters. | The URI of a resource to be included. |
| Restriction: | |