By Dan Kortschak, http://play.golang.org/p/8Jq_dPuwNF

StringBuilder_bytes.Buffer.go

func getReqAddons(r Request) string {
	var buf bytes.Buffer
	if len(r.RequestPlugins.RequestPlugin) != 0 {
		for _, v := range r.RequestPlugins.RequestPlugin {
			fmt.Fprintf(&buf, "  R: (%s) %s\n", v.Name,
				minify(v.RuleParameters.Xml))
		}
	}
	if len(r.ExtractionRules.ExtractionRule) != 0 {
		for _, v := range r.ExtractionRules.ExtractionRule {
			fmt.Fprintf(&buf, "  E: (%s: %s) %s\n", v.Name, v.VariableName,
				minify(v.RuleParameters.Xml))
		}
	}
	if len(r.ValidationRules.ValidationRule) != 0 {
		for _, v := range r.ValidationRules.ValidationRule {
			fmt.Fprintf(&buf, "  V: (%s) %s\n", v.Name,
				minify(v.RuleParameters.Xml))
		}
	}
	buf.WriteByte('\n')
	return buf.String()
}