Subject: Re: [xsl] XSLT workflow: ODF <-> XPP From: Martynas Jusevicius <martynas.jusevicius@xxxxxxxxx> Date: Thu, 28 May 2009 11:17:54 +0200 |
Thanks for a great reply Michael! I was having similar thoughts. Martynas On Thu, May 28, 2009 at 10:55 AM, Michael Kay <mike@xxxxxxxxxxxx> wrote: >> The problem is, that the two formats are not interchangeable, >> and this breaks the whole workflow. They have a filter to >> import ODF to XPP (the easy part). They also have another to >> convert back from XPP to ODF, but it discards XPP processing >> instructions that were added while styling. That means a >> roundtrip is not possible, because the existing inline XPP >> styling would be lost. > > This problem crops up all the time in different guises. It's the same as the > code-generation problem: you generate some code from say a visual query > builder, then you tweak the generated code, then you want to regenerate some > slightly different code without losing your tweaks. > > There's no general solution to the problem but there seem to be a number of > techniques that can half-solve the problem. > > (a) change the reverse transformation so that it doesn't discard the extra > information (the "processing instructions" or "tweaks"), but hides them > somewhere in the ODF where they will survive unscathed through the > operations performed at the ODF level - if necessary, as user-visible text > (though you can probably do better than that) > > (b) do a reconciliation: when the XPP is regenerated, compare it with the > "tweaked" XPP from the previous version, and try to find where the tweaks > are and reapply them to the new XPP version. This is a bit like merging of > branches in CVS. > > (c) change the way you "tweak" the XPP so that the changes are logged as you > make them and can be reapplied to a new version of the XPP. > > That's a very high-level description of ideas which might not translate > directly into the reality of the situation, but if you don't want to lose > the "tweaking" work then you're going to have to find something along one of > these lines. > > Since you are converting the XPP back to ODF already, I would look for a > solution along the lines of (a). A variant of this would be, instead of > hiding the tweaks in the ODF, generate a separate file containing all the > "tweaks", that can then be applied to the regenerated XPP, along the lines > of (c). > > Regards, > > Michael Kay > http://www.saxonica.com/ > http://twitter.com/michaelhkay
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