Re: [xsl] XSLT Filtering based on defined XML

[Jacquo Johnson <genxgeek@xxxxxxxxx>]

Actually, the nice thing about the requirements in this case is that
the source document will always be the same structure.  That is, it is
well defined other than the filters, which can change but only
according to the xml source document definition (just the xml
structure...not refering to a dtd here);:

Let's say the the following is the actual xml source contents (always
static):

<Root>
  <Node1/>
  <Node2>
     <Node21/>
     <Node22/>
 </Node2>
</Root>

Now the only available filters for this document would be:

Filter 1:
<Root>
  <Node1/>
</Root>

Output (from Filter1):
<Root>
  <Node1/>
</Root>
--
Filter 2:
<Root>
  <Node2>
     <Node21/>
 </Node2>
</Root>

Output (from Filter2):
<Root>
  <Node2>
     <Node21/>
 </Node2>
</Root>

Filter 3:
<Root>
  <Node2>
     <Node22/>
 </Node2>
</Root>

Output (from Filter3):
<Root>
  <Node2>
     <Node22/>
 </Node2>
</Root>

Filter 4:
<Root>
  <Node2/>
</Root>

Output (from Filter2):
<Root>
  <Node2>
     <Node21/>
     <Node22/>
 </Node2>
</Root>

Now, since I have a DOM object available I can dynamically create my
own xslt by recursing the filter and create <apply-templates
match="<CurrentNodeFromFilter>"/> and either <copy> if the node
doesn't have children or do a <copy-of> if the node has children.
Once I have the dynamic transform (as created per the filter) I can
call a transform with it on the xml source document to get me the
desired output.  This works but I think that it's kludgey.

----
On 8/16/05, Michael Kay <mike@xxxxxxxxxxxx> wrote:
> Your first challenge is to specify this more precisely.
>
> In early drafts of the XQuery specification there was a function called
> filter() which was a bit like this, but it got taken out because no-one was
> able to write a precise specification of what it was supposed to do.
> Sketching out an example isn't good enough. Start by producing a dozen
> examples: For example, what output do you want if one of the documents is
>
> <a><b/></a>
>
> and the other is
>
> <b><c/></b>
>
> then generalize from the examples to define the actual rules.
>
> Michael Kay
>
> > -----Original Message-----
> > From: Jacquo Johnson [mailto:genxgeek@xxxxxxxxx]
> > Sent: 16 August 2005 20:26
> > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> > Subject: [xsl] XSLT Filtering based on defined XML
> >
> > Hi All,
> >
> > Is there an elegant pattern via xslt to filter out an existing source
> > xml document based on the contents of another filter xml document?
> > For example:
> >
> > Source xml doc:
> > <Root>
> >    <Node1>
> >       <Node11>
> >         <Node111/>
> >       </Node11>
> >       <Node12/>
> >    <Node2>
> >    ...
> >
> > Filter xml doc:
> > <Root>
> >    <Node1>
> >      <Node111/>
> >    </Node1>
> > </Root>
> >
> > Desired results:
> > <Root>
> >    <Node1>
> >      <Node111/>
> >    </Node1>
> > </Root>
> >
> > Now the issue that I'm dealing with is that the filter xml doc is
> > dynamic.  That is, it can be different for any given xml source doc
> > configuration based on what another server source specifies.  I could
> > recursively build some dynamic xslt and add apply-templates for each
> > node and make use of copy and copy-of based on if a node has children
> > or not and then run that dynamically build transform on the xml doc
> > source...however, can anybody think of another way to do this?
> >
> > Thanks in advance!