[cxml-devel] RNG question

So I'm trying to parse a schema that has the following in it:

property-attach = element attach {

element parameters { fmttypeparam? & encodingparam? }?,

value-uri | value-binary }

In order to get this to work with cxml-rng, I have to do the following:

property-attach = element attach {

element parameters { fmttypeparam? & encodingparam? }?,

( value-uri | value-text ) }

Is the former invalid RNC or is cxml-rng's parser barfing where it shouldn't? A complete, minimal-ish example is shown below and attempting to parse it gives:

failed to parse compact syntax at char 552, file://+/Users/sly/projects/cl-vcard/foo.rnc: Unexpected terminal CXML-RNG::||| (value CXML-RNG::|||). Expected one of: (NIL CXML-RNG::} CXML-RNG::DOCUMENTATION-LINE CXML-RNG::[ :INCLUDE CXML-RNG::IDENTIFIER :START :DIV CXML-RNG::|)| CXML-RNG::CNAME CXML-RNG::|,|) [Condition of type CXML-RNG:RNG-ERROR]

Thanks,

Cyrus

# Hacked together from the RELAX NG Schema for iCalendar in XML

default namespace = "urn:ietf:params:xml:ns:icalendar-2.0-hack"

value-text = element text { xsd:string }

value-binary = element binary { xsd:string }

value-uri = element uri { xsd:anyURI }

encodingparam = element encoding { element text { "8BIT" | "BASE64" } }

fmttypeparam = element fmttype { value-text }

property-attach = element attach {

element parameters { fmttypeparam? & encodingparam? }?,

value-uri | value-text }

start = element icalendar { property-attach+ }