docs: def serialize_to_xml_str(obj_pyxb, pretty=True, strip_prolog=False, xslt_url=None):
      """Serialize PyXB object to pretty printed XML ``str`` for display.
  
      Args:
        obj_pyxb: PyXB object
          PyXB object to serialize.
  
        pretty: bool
          False: Disable pretty print formatting. XML will not have line breaks.
  
        strip_prolog:
          True: remove any XML prolog (e.g., ``<?xml version="1.0" encoding="utf-8"?>``),
          from the resulting XML doc.
  
        xslt_url: str
          If specified, add a processing instruction to the XML doc that specifies the
          download location for an XSLT stylesheet.
  
      Returns:
        str: Pretty printed XML document
  
      """
      return serialize_gen(obj_pyxb, None, pretty, strip_prolog, xslt_url)