Subject: RE: [xsl] New XSLT 3.0 Working Draft From: Michele R Combs <mrrothen@xxxxxxx> Date: Tue, 10 Jul 2012 18:01:00 +0000 |
Since relatively few folks adopted 2.0, what do we think the chances are of 3.0 being adopted? Michele -----Original Message----- From: Michael Kay [mailto:mike@xxxxxxxxxxxx] Sent: Tuesday, July 10, 2012 1:20 PM To: Xsl-List Subject: [xsl] New XSLT 3.0 Working Draft There's a new Working draft of XSLT 3.0 - the first new public draft for 2 years - at http://www.w3.org/TR/xslt-30/. There's an enormous amount of new material here. Big features: - Streaming - The analysis of streamability has been greatly simplified: it no longer requires any complex data flow analysis. This is achieved largely by not allowing variables to be bound to the nodes in a streamed document. Apart from that, most of the new features introduced for the benefit of streaming, such as xsl:iterate and xsl:stream, are largely intact. A major innovation is the introduction of "accumulators", values associated with nodes that can be computed during a streaming pass of a document; they have the usability of mutable variables while being defined in a purely functional way, and are sufficiently constrained that they don't inhibit optimization. - Packages - Intended for independent compilation of stylesheet components: they allow stylesheets to distinguish which components are internal and which are visible to the outside world. Gives general software engineering benefits by separating interface from implementation; allows constraining of what can be overridden/customized and makes overriding type-safe. - Maps - A new data type, similar to the dictionaries or associative arrays in other languages. The keys in the map can be any atomic value; the associated value can be any value whatsoever. A particular motivation for maps was that with streaming, you only get to see each thing in a document once, so you need to remember what you've seen for use later (for example, in an accumulator); so you need a richer data structure for holding this data. Maps also provide a useful mechanism for importing/exporting data to/from JSON format (for which there are new functions). - Higher-order functions - More an XPath feature than an XSLT one, functions are now first-class values and can be passed as parameters to functions, returned by functions, held in maps, etc etc. Other things include: * xsl:try/catch * xsl:evaluate * xsl:assert
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