RE: [Xquery] Comment constructors

David,
Responding to your XQuery comment of 19 Jan 2004 (attached):

In direct comment constructors, two adjacent hyphens in the content will 
be syntactically prohibited.

In computed comment constructors, two adjacent hyphens in the content will 
be defined to be a dynamic error (XQ0072). 

These changes will be reflected in the next version of the XQuery 
document.

Thanks for your suggestion!
--Don Chamberlin

------------------------------(referenced 
note)-------------------------------

From: David Carlisle <davidc@nag.co.uk> 
Date: Mon, 19 Jan 2004 14:04:00 GMT
To: public-qt-comments@w3.org 

Neither form of comment constructor gives any indication of what is to
happen if (after atomization/casting) the string contains the sequence 
"--"
or ends in "-" neither of which are allowed in an XML comment.

3.7.2 Other Direct Constructors
3.7.3.6 Computed Comment Constructors


<!-- abc -- xyz -->

comment { "-123-"}

Both appear to be legal Xquery, but neither can directly result in an
XML comment and the first can not result in an XPath/Xquery data model
comment node:
http://www.w3.org/TR/xpath-datamodel/#CommentNode
somewhat strangely only bans "--" but allows a trailing "-".

By contrast, the xslt2 draft says,

http://www.w3.org/TR/xslt20/#creating-comments

[ERR XT0950] It is a recoverable dynamic error if the result of
evaluating the content of the xsl:comment contains the string -- or ends
with -. The optional recovery action is to insert a space after any
occurrence of - that is followed by another - or that ends the comment.


David