Re: Finding paths in Visio XML exports - recursion qu
Seems like a typical graph structure. In 2004 I produced an XSLT 1.0 solution to finding all paths between two given nodes (and can be used naturally for graph traversal): http://lists.xml.org/archives/xml-dev/200401/msg00444.html Hope this will be helpful. -- Cheers, Dimitre Novatchev --------------------------------------- Truly great madness cannot be achieved without significant intelligence. --------------------------------------- To invent, you need a good imagination and a pile of junk ------------------------------------- Never fight an inanimate object ------------------------------------- You've achieved success in your field when you don't know whether what you're doing is work or play On Sat, Sep 27, 2008 at 12:20 PM, Steven Davies <xsl-list@xxxxxxxxxxx> wrote: > Hi everyone, > > while I'm not a total XSLT newbie I'm having trouble getting my head > round a couple of things when trying to find paths through Visio > flowcharts which have been exported in Visio's XML format. > > Very basically, for anyone who is unaware of Visio's schema I shall try > to describe it below with a very simplified example: > > <Pages> > <Page ID="1"> > <Shapes> > <Shape ID="1" NameU="CustomShape.112"> > <Shape-specific-data /> > </Shape> > <Shape ID="2" NameU="CustomShape.8"> > <Shape-specific-data /> > </Shape> > <Shape ID="3" NameU="CustomShape.32"> > <Shape-specific-data /> > </Shape> > </Shapes> > <Connects> > <Connect FromSheet="1" FromCell="BeginX" ToSheet="1" /> > <Connect FromSheet="1" FromCell="EndX" ToSheet="2" /> > <Connect FromSheet="2" FromCell="BeginX" ToSheet="2" /> > <Connect FromSheet="2" FromCell="EndX" ToSheet="3" /> > </Connects> > </Page> > </Pages> > > Obviously there are many more <Shape>s and <Connect>s in the document! > The <Connect>s map from a <Shape> whose ID is the same as @ToSheet and > @FromCell="BeginX" to a <Shape> whose ID is the same as @ToSheet and > @FromCell="EndX". > > Now, I can use an XPath expression to find the first node in the > document easily enough (it has a certain property in its data set to > "1") and the only way I've been able to find all connected shapes from > this one is to use 3 for-each loops: the first over all <Connect>s > beginning at the shape itself, the second nested loop over all other > endpoints of the <Connect> (there will only ever be one) and the third > over all <Shape>s connected to the <Connect>: > > <xsl:variable name="thisShapeID" select="./@ID"/> > <xsl:for-each select="../../v:Connects/v:Connect[@ToSheet=$thisShapeID > and @FromCell='BeginX']"> > <xsl:variable name="connectFromSheet" select="./@FromSheet"/> > <xsl:for-each select="../v:Connect[@FromSheet=$connectFromSheet and > @FromCell='EndX']"> > <xsl:variable name="nextShapeID" select="./@ToSheet"/> > <xsl:for-each select="../../v:Shapes/v:Shape[@ID=$nextShapeID]"> > > I had to use the xsl:variables because I couldn't get the equation > [@ID=./@ToSheet], for example, to work (it never matched, any ideas with > this?). > > Inside the innermost xsl:for-each I recursively call the template which > works very well for a straight flow in Visio. However, there can be > infinite loops in the flow so I have to first test whether the <Shape> > has already been output before recursing. This works. > > Also the flows can branch off in multiple directions and each branch > needs to be output one at a time (i.e. the nodes before the branch only > need to be output once). This also works. > > My problem is that I need to output a message (well, an element - eventually > this will be XSL-FO) every time the end of a path is reached. This could be > because the flow looped back, that is, the recursion is stopped, or it could > be because the end of a branch (and therefore outermost for-each) was > reached. While this is relatively easy to do, I end up getting multiple > copies of the node output because of the multiple levels of recursion. > > Does anyone have an idea how to get around this? > > If you have any questions about this please let me know - I'm thinking about > this on a more conceptual level than practical level as I'd like to get my > head around it rather than just trying things blindly! Unfortunately I can't > provide the flowchart as it's confidential but I can make a mock-up in the > Gimp if anyone thinks it would help. > > Many thanks if you got this far ;-) > Steve
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