def grammar_init(self):
self.coefficient = default(
self.find('coefficient'),
Coefficient.from_attributes(numerator='1', denominator='1'))
self.compound = self.find('compound')
self.charge = default(self.find('charge'),
Charge.from_attributes(value='0', sign=''))
self.state = default(self.find('state'),
State.from_attributes(state=''))
def grammar_init(self):
self.item = self.get('element') or self.get('group')
self.count = default(string(self.get('number')), '1')
def grammar_init(self):
self.value = default(string(self.find('number')), '1')
self.sign = string(self.find('sign'))