search for maximum hierarchy

[KemperR]

Dear All,

may be some of you can help me with an XSLT example how to solve the
following challange.
For the XML below I want to find out the maximum hierarchy level for a
specific element in my XSLT. The result for the example (searching for
<A/>) should be 4 as the element A is nested 4 times maximum.
I guess I have to use somehow the count function with 'following::A'
axes. But I could not get that to work yet.

Thanks a lot for your help
Rolf

<ROOT>
<A>
<A>
<B>
<C>
<A/> nested up to 3
</C>
</B>
</A>
<A>
<B>
<C>
<A>
<A/> nested up to 4
</A>
<C>
</B>
</A>
</A>
</ROOT>

[William Park]

J?rgen Kahrs <Ju************ *********@vr-web.de> wrote:

William Park wrote:

You had XSL and xmlgawk solution. Here is Bash shell solution:

start () { # Usage: start tag att=value ...
count=`echo ${XML_ELEMENT_S TACK[*]|/$1} | wc -w`
[[ count -gt $1 ]] && eval $1=`echo $count`
}
xml -s start "<ROOT>...</ROOT>"
declare -p A B C
Very short indeed. But a bit cryptic.

Explanation:
- ${...|/glob} returns all array element matching 'glob' pattern.
In this case, 'A', 'B', 'C'.

This is a very powerful feature that is missing in xmlgawk.
In xmlgawk an explicite loop is needed.

This is only available in my patch Bash shell. Standard Bash/Ksh/Zsh
doesn't have it. In Python, it's called list comprehension. But, in
shell-speak, it's nothing more than parameter expansion (around for 30
years) plus some content filtering (denoted by '|').

- `echo $count` is needed to strip leading whitespaces put there
by 'wc -w'.

The descendents of the Bourne shell are not really first choice
for arithmetic applications.

Actually, integer expression is fairly complete. For example,
${var[i]}
${var:i:j}
(( i ))
both 'i' and 'j' can be full arithmetic expression. It's the float
point which is the problem. Bash can't do floating point. Awk is much
better at that.

--
William Park <op**********@y ahoo.ca>
Open Geometry Consulting, Toronto, Canada