Add xml-stylesheet processing instructions to boost property_tree

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I am using boost/property_tree to create an XML file. Unfortunately I cannot figure out how to add xml-stylesheet processing instructions to the file.Desirable output:\[code\]<?xml version="1.0" encoding="utf-8"?> <-- This is added automatically<?xml-stylesheet type="text/xsl" href="http://stackoverflow.com/questions/12805633/report.xsl"?> <-- How to add this line<report>...</report>\[/code\]Is that possible with boost/property_tree/ptree?