Subject: Re: [exsl] Naming exsl:return/exsl:result (Was: Re: [xsl] Functional programming in XSLT) From: tcn@xxxxxxxxxxxxx (Trevor Nash) Date: Tue, 20 Mar 2001 11:13:28 GMT |
Jeni Tennison wrote: >... >I think we need an imperative term that doesn't imply that the >function terminates. exsl:result-in, exsl:fix-result, >exsl:set-result... others? > Not sure why you say 'imperative'. I think we need to forget that this element is specifying the result of a function - we know that because it's in a function body . The reason we need an element at all is that we want alternatives to returning an RTF. Colin Muller suggested exsl:value-of which seems along the right lines, except of course there is already xsl:value-of. If I am reading the EXSL proposal correctly a function body containing <xsl:value-of .../> would return an RTF containing a text node, whereas <exsl:value-of .../> would be returning potentially any sort of object, say a string. To use the same name would be confusing IMHO. So, what about simply exsl:object? Or, if we need to explicitly convert to a type, exsl:string, exsl:node-set, exsl:boolean? <aside> Apart from anything else this will help those with an imperative language background to resist the temptation to put <exsl:return /> at the end of a nicely constructed RTF.</aside> This would maybe help with the discussion about what it means to have more than one 'result' declaration. To end up with a result with more than one exsl:boolean in it is obviously wrong, as is a mixture of types (probably). But maybe having several exsl:strings is OK: the return value is formed by catenation. In implementation terms maybe you always build an RTF-like structure, with special nodes to determine how it should be converted to a specific type. rename xsl:value-of to xsl:string anyone?? Can one put these things inside an xsl:variable, and then return the variable? Regards, Trevor Nash XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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