def serialize_sentences(input_file):
f_in = open(input_file, "rb")
sentences = []
context = etree.iterparse(f_in, tag="S")
for event, sentence_elem in context:
sent_obj = Sentence()
for word_elem in sentence_elem.iter("W"):
idx = word_elem.attrib["ID"]
lemma = word_elem.attrib["LEMMA"]
sent_obj.add_word(lemma, int(idx))
dom = word_elem.attrib["DOM"]
if dom != "_root":
link_type = word_elem.attrib["LINK"]
sent_obj.add_link(int(idx), int(dom), link_type)
sentences.append(sent_obj)
return sentences
