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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def newDocPI(self, name, content):
 """Creation of a processing instruction element. """

        ret = libxml2mod.xmlNewDocPI(self._o, name, content)
        if ret is None:raise treeError('xmlNewDocPI() failed')
        __tmp = xmlNode(_obj=ret)
        return __tmp