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repost -Difficulties with xml


repost of my original message, which did not make it in full the first time for some reason:


Dear all,

I am having problems accessing and changing xml attributes/properties after importing an xml file and I'm looking for some help.

z=Import["xmltest.xml","XML"];

part of z looks like the following (sorry for the long lines here)

XMLElement[ensemble, {ensemble->1}, { XMLElement[peak, {peakID->1},  { XMLElement [freq,{},{3.123}] ,  XMLElement [vol,{},{12.12}] } ] , XMLElement[peak, {peakID->2},  { XMLElement [freq,{},{8.101}] ,  XMLElement [vol,{},{0.552}] }]}]
XMLElement[ensemble, {ensemble->2}, { XMLElement[peak, {peakID->1},  { XMLElement [freq,{},{6.163}] ,  XMLElement [vol,{},{2.111}] } ] , XMLElement[peak, {peakID->2},  { XMLElement [freq,{},{12.884}] ,  XMLElement [vol,{},{0.221}] }]}]


Could anybody give me an hint about the correct syntax to use to be be able to directly access and change the value of the freq attribute of peakID2 of ensemble2 for instance?
I just can't seem to be able to find it after reading Mathematica's documentation.

Thanks so much in advance,

Pascal


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