import svgwrite

class XML2SVG(svgwrite.container.SVG):
    def __init__(self, xml, insert=None, size=None, **extra):
        self.xml = xml

        super().__init__(**extra)

    def get_xml(self):
        xml = self.xml

        for attribute, value in sorted(self.attribs.items()):
            # filter 'None' values
            if value is not None:
                value = self.value_to_string(value)
                if value:  # just add not empty attributes
                    xml.set(attribute, value)

        for element in self.elements:
            xml.append(element.get_xml())
        return xml