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The XHTML2 draft spec linked to specifies <blockcode> as only using the 'Common' attribute collection (http://www.w3.org/TR/2003/WD-xhtml2-20030506/mod-block-text.html#edef_block-text_blockcode), ie 'class' in this case is for presentation (style) purposes only.
I'd speculate that it's only used in the example to illustrate how you might differentiate code samples of different types(presentationally). It should perhaps explicitly say that in the spec...
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