The SMIL <par> element has a child element named <text>. This is an empty element that only contains a reference to an external media object. It does not contain textual information in itself.
Typical syntax of the <text> element is:
<text src="document.html#fragment" id="id-value" />
The src attribute contains a URI that points to the XML element that is currently synchronized.
src attribute value uses a URI that contains not only the name of the XML Text Content document, but also (following the # character) a fragment of that document. The target fragment is always the value of an id attribute in the XML Text Content document.
The id attribute contains a unique identifer of the <text> element itself. This is here so that other URIs (for example, those in the NCC) can refer to this element.