Quoting Chaitanya Gupta (mail@chaitanyagupta.com):
  

CL-USER> (flexi-streams:with-input-from-sequence (s *x)
          (cxml:parse s (cxml-dom:make-dom-builder)))
    

[...]
  

Only file streams are supported?
    

Thanks for the report.  That was a bug in PARSE, which should be fixed
in cxml CVS now.

  

For now, you'd have to open the socket using :element-type
'(unsigned-byte 8), or take advantage of bivalent streams on Lisps that
provide them.