old_contents: import os
  
  import fastobo
  
  from .base import BaseParser
  from ._fastobo import FastoboParser
  
  
  class OboParser(FastoboParser, BaseParser):
      @classmethod
      def can_parse(cls, path, buffer):
          return buffer.lstrip().startswith((b"format-version:", b"[Term", b"[Typedef"))
  
      def parse_from(self, handle):
          # Load the OBO document through an iterator using fastobo
          doc = fastobo.iter(handle)
  
          # Extract metadata from the OBO header and resolve imports
          self.ont.metadata = self.extract_metadata(doc.header())
          self.ont.imports.update(
              self.process_imports(
                  self.ont.metadata.imports,
                  self.ont.import_depth,
                  os.path.dirname(self.ont.path or str()),
                  self.ont.timeout,
              )
          )
  
          # Extract frames from the current document.
          try:
              for frame in doc:
                  if isinstance(frame, fastobo.term.TermFrame):
                      self.enrich_term(frame)
                  elif isinstance(frame, fastobo.typedef.TypedefFrame):
                      self.enrich_relationship(frame)
          except SyntaxError as s:
              location = self.ont.path, s.lineno, s.offset, s.text
              raise SyntaxError(s.args[0], location) from None
  
new_contents: import os
  
  import fastobo
  
  from .base import BaseParser
  from ._fastobo import FastoboParser
  
  
  class OboParser(FastoboParser, BaseParser):
      @classmethod
      def can_parse(cls, path, buffer):
          return buffer.lstrip().startswith((b"format-version:", b"[Term", b"[Typedef"))
  
      def parse_from(self, handle):
          # Load the OBO document through an iterator using fastobo
          doc = fastobo.iter(handle, ordered=True)
  
          # Extract metadata from the OBO header and resolve imports
          self.ont.metadata = self.extract_metadata(doc.header())
          self.ont.imports.update(
              self.process_imports(
                  self.ont.metadata.imports,
                  self.ont.import_depth,
                  os.path.dirname(self.ont.path or str()),
                  self.ont.timeout,
              )
          )
  
          # Extract frames from the current document.
          try:
              for frame in doc:
                  if isinstance(frame, fastobo.term.TermFrame):
                      self.enrich_term(frame)
                  elif isinstance(frame, fastobo.typedef.TypedefFrame):
                      self.enrich_relationship(frame)
          except SyntaxError as s:
              location = self.ont.path, s.lineno, s.offset, s.text
              raise SyntaxError(s.args[0], location) from None
  
subject: Make sure to parse OBO documents in order