<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def xml(self, indent = ""):
 """Render an XML representation of the metadata"""
 #(independent of web.py for support in CLAM API)
        if not indent:
            xml = '<?xml version="1.0" encoding="UTF-8"?>\n'
        else:
            xml = ""
        xml += indent + "<CLAMMetaData format=\"" + self.__class__.__name__ + "\""
        if self.mimetype:
            xml += " mimetype=\""+self.mimetype+"\""
        if self.schema:
            xml += " schema=\""+self.schema+"\""
        if self.inputtemplate:
            xml += " inputtemplate=\""+self.inputtemplate+"\""
        xml += ">\n"

        for key, value in self.data.items():
            xml += indent + "  <meta id=\""+clam.common.util.xmlescape(key)+"\">"+clam.common.util.xmlescape(str(value))+"</meta>\n"

        if self.provenance:
            xml += self.provenance.xml(indent + "  ")

        xml += indent +  "</CLAMMetaData>"
        return xml