m:data-value / m:data-type only on anonymous RDF node?

[Svante Schubert <Svante.Schubert@Sun.COM>]

The question is what is the RDF statement m:data-value and m:data-type 
are part of?

As a reminder the optional attributes m:data-value and m:data-type can 
occur on every element, where m:about/m:property can occur as well 
(therefore not on text:meta-field).

<attribute name="m:data-type">
    <data type="anyURI"/>
</attribute>
<attribute name="m:data-value">
    <ref name="string"/>
</attribute>

Each of them is an RDF predicate, the RDF object is anyURI in case of 
m:data-type and a string in case of m:data-value.
But what is the RDF subject, it can not be the literal (element content) 
itself, as a literal is never a RDF subject.

I would think it is the element, which is anonymous in RDF (without an IRI).

In this case, without using an xml:id to bind the OpenDocument element 
via the meta manifest to an IRI, the data-type and data-value will never 
be part of the larger RDF graph of the document.

Is this correct?

Svante