Entities in Attribute Values
aray at q2.net
Fri Jun 13 06:51:45 BST 1997
On Thu, 12 Jun 1997, David Schach wrote:
> Because entity references are allowed inside ot attribute values, it is
> not possible to store an unmodified URL with data in an attribute. For
> example, the following XML is not valid because the '&''s are not
> escaped inside of SELF's HREF value.
This is a problem only if '&' *must* be the field separator. Why not
something else,, like ';' ?
> n&dilbert=on&calvin=on&peanuts=on" />
> This makes it inconvenient to store URL's in XML files. Would it anyone
> be interested in changing entity processing to fix this?
IMHO, there's no need for that. Or, at any rate, there shouldn't be. Using
'&' as a field separator in "query URLs" is a historical artefact of lack
of RTFM. The problem was recognized reasonably early too, and a fix was
proposed, but no HTML browser implementor of, ah, consequence ever got a
>From RFC 1866, Section 8.2.1 "The form-urlencoded Media Type":
NOTE - The URI from a query form submission can be
used in a normal anchor style hyperlink.
Unfortunately, the use of the `&' character to
separate form fields interacts with its use in SGML
attribute values as an entity reference delimiter.
For example, the URI `http://host/?x=1&y=2' must be
written `<a href="http://host/?x=1&y=2"' or `<a
HTTP server implementors, and in particular, CGI
implementors are encouraged to support the use of
`;' in place of `&' to save users the trouble of
escaping `&' characters this way.
We're not committed to perpetauting mistakes, are we?
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