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RE: [xsl] Best default value for a result tree fragment?
Subject: RE: [xsl] Best default value for a result tree fragment? From: "Michael Kay" <mike@xxxxxxxxxxxx> Date: Wed, 28 Sep 2005 13:07:04 +0100 |
> What do people think is the "best" way of specifying the > default value for > the parameters: > > <xsl:param name="contentRTF"></xsl:param> > > which gives a RTF containing nothing No: if there is no content and no select attribute, the value is a zero-length string. You can get an RTF consisting of a document node with no children by writing, for example <xsl:param name="contentRTF"><xsl:fallback/></xsl:param> > > <xsl:param name="contentRTF" select="" /> > > which gives an empty nodeset (or something), No, that's an error: the select attribute must be an XPath expression, and this isn't or even > > <xsl:param name="contentRTF select="''" /> > > which gives an empty string. > > I appreciate that, for all practical purposes, I should get the same > output from all of them, but was wondering which might be seen as the > canonical way of doing it, given that any *passed* value will > always be a > result tree fragment. Must have my strong-typing head on today :-) > I agree that logically, a document node with no children makes the most sense. In 2.0, the cleanest way of constructing this is <xsl:param name="x" as="document-node()"> <xsl:document/> </xsl:param> Michael Kay http://www.saxonica.com/
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