func toPropertiesString(e graphElement) ([]byte, error) {
properties := map[string]interface{}{
"_ID": string(e.ID),
"_host": e.host,
}
for k, v := range e.metadata {
if k[0] == '_' {
return nil, errors.New("Properties starting with _ are reserved")
}
properties[k] = v
}
encoder := gremlin.GremlinPropertiesEncoder{}
err := encoder.Encode(properties)
return encoder.Bytes(), err
}
