Subject: RE: [xsl] An empty sequence is not allowed as the first argument ... From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Sun, 4 Jun 2006 21:14:51 +0100 |
> Mike will probably have the definitive answer on this one. > Given how it's now late on Friday over in the UK, however, Even later in France where I've been taking a holiday... > > How about having a wrapper function that will accept any > argument or none, and does type-checking on it before calling > your actual formatting function? XPath 2.0 has the "castable > as" operator to help with this kind of thing. It all depends what you want to happen when invalid data is encountered. If you want anything other than a fatal error from the transformation, you have to code in the checks yourself. > In my XSLT 2.0 dates processing (which like yours, doesn't assume > schema-validity) I have a function that assigns a date of Jan 1, year > 1 to things that aren't properly dated (which means "things > my code can't make a date out of"). Two other approaches are to use the empty sequence to signify an invalid date, and to use a union type. Union types aren't particularly well supported - but after a week on holiday, I forget exactly what the limitations are. Michael Kay
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