On Dec 2, 4:51 pm, Dennis <shr3ks...@gmail.com> wrote:
> The XML is of the form:
> ganglia
>   multiple clusters
>     multiple hosts
>       multiple metrics

Use XPath. Seriously, I hate XML and XSLT, but XPath is simply the
most concise way to extract things from a nested structure. Most XPath-
libraries allow for precompilation of XPath-expressions (similar to
RegEx-precompilation) and don't require the whole XML-file to reside
in memory, which makes this a nice solution for huge XML-files (though
in your case this is probably no issue).

To get a list of all metrics in all hosts in all clusters, you'd
simply use the XPath-expression "ganglia/cluster/host/metric" against
an XML-document; recursive fetching (if clusters could contain other
clusters) could be done by using a double slash instead of a single
slash.

A Clojure-solution for a similar expression language would be
clojure.contrib.zip-filter.xml, though I did not use it, but you might
try it out.

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