Turtle syntax question

A common construct in turtle files is the following:

     ex:fooInstance ex:predicate ex:barInstance .

In other words, three qnames followed by a period, denoting a statement.

A problem arises if any of the qnames contains a period, like this:

     ex:foo.instance ex:pred.i.cate ex:bar.instance .

In this case, the first period is interpreted as a statement  
terminator, resulting in a parsing error.  Looking into the turtle  
grammar at [1], I found much to my surprise that a period is not  
allowed in such identifiers in turtle.  In contrast, the period is  
allowed in XML -- see the NameStartChar and NameChar productions at  
[2] and [3].  It is likewise allowed in RDF.

This seems like a serious limitation of turtle.  Am I missing something?

Thanks,

Ian

[1] http://www.dajobe.org/2004/01/turtle/#sec-grammar-grammar
[2] http://www.w3.org/TR/REC-xml/#NT-NameStartChar
[3] http://www.w3.org/TR/xml11/#NT-NameStartChar