Subject: Re: Future XSLT expansion. From: "Jon Smirl" <jonsmirl@xxxxxxxxxxxx> Date: Sun, 19 Mar 2000 12:03:23 -0500 |
Variables contain result tree fragments. A result tree fragment (the stuff inside the variable) only allows a subset of the node set operations. Using the result tree fragment in <xsl:apply-templates select="$x"> would require the use of /, //, and [] even if only implicitly and the spec forbids this. Without this restriction stylesheets couldn't be completely compiled. XSL would have to have a run-time eval function. XSLT Section 11.1 is what forbids this, you just didn't quote enough of it in your earlier mail. 11.1 Result Tree Fragments Variables introduce an additional data-type into the expression language. This additional data type is called result tree fragment. A variable may be bound to a result tree fragment instead of one of the four basic XPath data-types (string, number, boolean, node-set). A result tree fragment represents a fragment of the result tree. A result tree fragment is treated equivalently to a node-set that contains just a single root node. However, the operations permitted on a result tree fragment are a subset of those permitted on a node-set. An operation is permitted on a result tree fragment only if that operation would be permitted on a string (the operation on the string may involve first converting the string to a number or boolean). In particular, it is not permitted to use the /, //, and [] operators on result tree fragments. When a permitted operation is performed on a result tree fragment, it is performed exactly as it would be on the equivalent node-set. Jon Smirl jonsmirl@xxxxxxxxxxxx XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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