spec clarification/errata

I can't find the errata page (the one referenced from
the spec is empty) so I don't know if this is a known
issue.

Jeff Sussna noted that my example for a property with a
reification ID wasn't compliant with the formal
grammar. Here's 6.12:

[6.12] propertyElt ::= 
     '<' propName idAttr? '>' value '</' propName '>' 
   | '<' propName idAttr? parseLiteral '>' literal '</'
propName '>'
   | '<' propName idAttr? parseResource '>'
propertyElt* 
     '</' propName '>' 
   | '<' propName idRefAttr? bagIdAttr? propAttr* '/>'

I had:

<rdf:Description about="Jimmy">
  <playsFor rdf:ID="44" rdf:resource="Pirates"/>
</rdf:Description>

The grammar doesn't allow an idAttr and a resourceAttr
on the same property. The idAttr is shown explicitly on
the first three productions but is made into a
disjunction on the last one with resourceAttr via the
use of idRefAttr. This doesn't seem right. Its not a
big deal since most people don't use reification let
alone the idAttr on properties. Still...

Cordially from Corvallis,

Gabe Beged-Dov

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