code: def _xml(self, prefix=""):
      s = prefix + "<g "
      s += 'id="%s" ' % self._id
      s += self._transform.xml
      s += self._style.xml
      s += ">\n"
      for item in self._items:
          s += item._xml(prefix=prefix + "   ")
      s += prefix + "</g>\n"
      return s
  
file_path: vispy/vispy/util/svg/group.py
imports: import copy
  from ...util import logger
  from .path import Path
  from .base import namespace
  from .transformable import Transformable
label_desc: Use image node_id 6 for calling the Group obj's underlying member method code with example usage: obj._xml(prefix) and returns: s