def METHOD_NAME(self) -> str:
    root = ET.Element("Relationships")
    root.set("xmlns", SCHEMAS.RELATION)
    ET.SubElement(
        root,
        "Relationship",
        Target="/3D/3dmodel.model",
        Id="rel-1",
        Type=SCHEMAS.MODEL,
        TargetMode="Internal",
    )
    return ET.tostring(root, xml_declaration=True, encoding="utf-8")