RE: XSLT 2.0 empty string
-----Original Message----- From: Michael Kay The variable was defined as: <xsl:variable name="foo" select="nothing" as="xs:string?"/> The select expression yields a node-sequence, the as expression requires atomic values, so XSLT invokes atomization. The result of atomizing an empty node-sequence is an empty sequence of strings. > > But I think it's true to say that as="xs:string" does _not_ force an > empty sequence to coerce to an empty string, isn't it? The only conversions forced by the "as" attribute are atomization and numeric promotion (e.g. int to double). It doesn't cause a cast. If the "as" attribute had said "xs:string" rather than "xs:string?", a type error would be reported. Is the error XT0570? [ERR XT0570] It is a type error if the supplied value of a variable cannot be converted to the required type. How should we read the '?' in this case? Convert to string if you can, else don't bother? regards DaveP -- DISCLAIMER: NOTICE: The information contained in this email and any attachments is confidential and may be privileged. If you are not the intended recipient you should not use, disclose, distribute or copy any of the content of it or of any attachment; you are requested to notify the sender immediately of your receipt of the email and then to delete it and any attachments from your system. RNIB endeavours to ensure that emails and any attachments generated by its staff are free from viruses or other contaminants. However, it cannot accept any responsibility for any such which are transmitted. We therefore recommend you scan all attachments. Please note that the statements and views expressed in this email and any attachments are those of the author and do not necessarily represent those of RNIB. RNIB Registered Charity Number: 226227 Website: http://www.rnib.org.uk
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