The support for RDFa in ODF 1.2 is intended to cover only a very limited use case: to allow for creating RDF statements that have as their object some text from the document content itself. This is very different from RDFa in XHTML. Because XHTML is a single file format, the embedded RDFa must necessarily be very flexible and expressive, because it is used to express all the RDF metadata. But an ODF document may contain an arbitrary number of RDF/XML files, and these should be used for most metadata purposes. The RDF/XML files can refer to document elements via relative URIs, using the element's xml:id attribute. ODF 1.2 only includes some RDFa attributes in the content to allow for creating RDF statements that directly contain document content without forcing producers to actually duplicate that content in an RDF/XML file.