dart xml with external files -

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i've been able follow examples of dart-xml dart file containing xml in variable. how parse , create external xml files?

if try , import xml file directly dart gets stuck on first character of xml file '<'.

how write given example dart-xml https://github.com/renggli/dart-xml? can print shell using 

print(bookshelfxml.tostring());

but how save || pipe external file? i've tried use dart:io little not having success @ moment.

this should want: 

import 'dart:io';  ...  var file = new file('path/to/file.xml'); file.writeasstring(bookshelfxml.tostring());

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