code: def validate(filename=None, ocrd_page=None, ocrd_file=None, strictness='strict', strategy='index1'):
          
          if ocrd_page:
              validator = PageValidator(ocrd_page, strictness, strategy)
          elif ocrd_file:
              validator = PageValidator(page_from_file(ocrd_file), strictness, strategy)
          elif filename:
              validator = PageValidator(parse(filename, silence=True), strictness, strategy)
          else:
              raise Exception("At least one of ocrd_page, ocrd_file or filename must be set")
          return validator._validate()
docs: Validates a PAGE file for consistency by filename, OcrdFile or passing OcrdPage directly.
  
          Arguments:
              filename (string): Path to PAGE
              ocrd_page (OcrdPage): OcrdPage instance
              ocrd_file (OcrdFile): OcrdFile instance wrapping OcrdPage
              strictness (string): 'strict', 'lax', 'fix' or 'off'
              strategy (string): Currently only 'index1'
  
          Returns:
              report (:class:`ValidationReport`) Report on the validity