Type conversions

• From: Martin Tapp <tappm@cae.com>
• Date: Mon, 28 Jan 2002 13:43:05 -0500
• To: www-ql@w3.org
• Message-ID: <8A6A2A139700D5118EB6009027B0FF3A014DCD80@caemsx02.cae.ca>

Hi,

I was woundering how a type conversion works when no schema/DTD is
available.  If I look at the Basic Conversion Rules (from section 2.1.2 of
http://www.w3.org/TR/xquery), it states:

"If the (given or extracted) value has an unknown simple type (as in the
case of character data in a schemaless document), an attempt is made to cast
it to the required simple type. If the cast fails, a type exception is
invoked."

Does this mean that if an element contains the text "5.0" and the requested
type is xs:decimal, the string value is extracted and converted to
xs:decimal?  Or does it try to call the constructor xf:decimal with the
string value?  Or does it simply generates an error because there is no
typed value?  It is not clear to me witch case it is, because everything
seems to suppose a typed-value is available.

Thanks for any info!

Martin Tapp

Received on Monday, 28 January 2002 13:50:46 UTC