RDF here or not?

Three examples of valid XHTML files. Are there RDF triples in these HTML documents?

• RDF here or not? - HTML comment
• RDF here or not? - <script>
• RDF here or not? - <object>

• Using RDF/XML with HTML and XHTML, in RDF/XML Syntax Specification (Revised)
• RDF in HTML: Approaches, Sean B. Palmer
• W3C TAG Issue RDFinXHTML-35: Syntax and semantics for embedding RDF in XHTML

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Dave Beckett