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> > For the time being such support will be provided by the FXSL > > monadic implementation. > > > > Before publishing the initial implementation I'm trying to > > collect a number of good-use examples, like maintaining > > state, update-in-place Arrays, IO from external files, > > synchronous exceptions. > > I've seen some examples recently where initializing a Java object > requires two calls: a constructor and an initialization. > > <xsl:variable name="x" select="java:object.new()"/> > <xsl:do select="setProperty($x,17)"/> > <xsl:value-of select="$x"/> > > Somehow the second instruction has to be forced to happen before the > third. The way I fudge it at present is to write the "xsl:do" as > "xsl:value-of", but I've had to tweak the optimizer so it doesn't > skip > the instruction because it recognizes statically that the result is > always empty. Thank you Mike, for the good example. BTW, what is xsl:do? I couldn't find it in the current WD spec. > > Generally the Saxon optimizer has now got to the level where external > functions with side-effects are becoming very troublesome. I've been > thinking of introducing some kind of construct to force sequential, > unoptimized execution of a sequence of instructions. (And for the > time > being, I've overloaded the attribute saxon:assignable="yes" to > achieve > this effect). I've heard horror stories of an XSLT processor completely discarding an xsl:variable and then re-evaluating it. In such case even a monadic implementation will not help -- there must be something to tell the processor not to discard and "recreate" a certain variable, because evaluating its value causes a side-effect. In the absence of the ability to express that a variable is of type IO a this would be the way to say it. ===== Cheers, Dimitre Novatchev. http://fxsl.sourceforge.net/ -- the home of FXSL __________________________________________________ Do you Yahoo!? Yahoo! Web Hosting - establish your business online http://webhosting.yahoo.com XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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