code: def parse_xhtml_species_notes(entry):
      
      properties = {}
      if entry.xml_notes is not None:
          cobra_notes = dict(parse_xhtml_notes(entry))
  
          for key in ('pubchem_id', 'chebi_id'):
              if key in cobra_notes:
                  properties[key] = cobra_notes[key]
  
          if 'formula' in cobra_notes:
              properties['formula'] = cobra_notes['formula']
  
          if 'kegg_id' in cobra_notes:
              properties['kegg'] = cobra_notes['kegg_id']
  
          if 'charge' in cobra_notes:
              try:
                  value = int(cobra_notes['charge'])
              except ValueError:
                  logger.warning(
                      'Unable to parse charge for {} as an'
                      ' integer: {}'.format(
                          entry.id, cobra_notes['charge']))
                  value = cobra_notes['charge']
              properties['charge'] = value
  
      return properties
docs: Return species properties defined in the XHTML notes.
  
      Older SBML models often define additional properties in the XHTML notes
      section because structured methods for defining properties had not been
      developed. This will try to parse the following properties: ``PUBCHEM ID``,
      ``CHEBI ID``, ``FORMULA``, ``KEGG ID``, ``CHARGE``.
  
      Args:
          entry: :class:`SBMLSpeciesEntry`.