Subject: [xsl] XSLT Streaming Terminology: Roaming From: "Costello, Roger L." <costello@xxxxxxxxx> Date: Sat, 15 Feb 2014 10:33:42 +0000 |
Hi Folks, The XSLT 3.0 specification defines roaming like so: Roaming: indicates that the nodes returned by an expression could be anywhere in the tree. For example, expressions using the axis steps following or preceding will typically be roaming. Suppose I create a function. I pass to it the context node and it returns some nodes: <xsl:function name="f:get-nodes" as="element()*"> <xsl:param name="context-node" /> ... </xsl:function> The function is a black box; the nodes that it returns could be from anywhere in the XML document. So this expression: f:get-nodes(.) is roaming. Next, suppose the XSLT processor is positioned at the first <title> element: Document> <title>A</title> <section> <title>B</title> <section> <title>C</title> </section> </section> </Document> This expression: following::section returns all <section> elements that follow the <title> element. Apparently that expression is roaming. But I don't see why. Roaming means that the expression could returns nodes from "anywhere in the tree." Clearly this expression: following::section is not returning nodes from "anywhere in the tree." Rather, it is returning nodes from a well-defined location in the tree. I understand how f:get-nodes(.) could return nodes from anywhere in the tree, but I don't see how following::section could return nodes from anywhere in the tree. Would you shed light on this please? /Roger
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