Retrieving namespace as schema?

When trying to validate http://heima.olivant.fo/~styrheim/xml/cd-toc/ol.xml 
with 
http://www.w3.org/2001/03/webdata/xsv?docAddrs=http%3A%2F%2Fheima.olivant.fo%2F%7Estyrheim%2Fxml%2Fcd-toc%2Fol.xml&warnings=on&keepGoing=on&logOK=on&style=xsl, 
I get
...
Attempt to load a schema document from http://www.w3.org/1999/xhtml 
(source: docElt) for http://www.w3.org/1999/xhtml, failed:
Not recognised as W3C XML Schema or RDDL: html
...
That seems a bit strange, as
xmlns:html="http://www.w3.org/1999/xhtml"
is a specification of a namespace, not of a schema location?

(IE says my xml is valid, xmlspy says my schema is invalid)


Jan Egil Kristiansen
Faroe Islands