这是一个简短但完整的示例，其中使用了@Steven提到的自定义解析器技术。
from StringIO import StringIO
from lxml import etree
data = dict(
xml_file = '''<?xml version="1.0"?>
<!DOCTYPE x SYstem "a.dtd">
<x><y>ézz</y></x>
''',
dtd_file = '''<!ENTITY eacute "é">
<!ELEMENT x (y)>
<!ELEMENT y (#PCDATA)>
''')
class DTDResolver(etree.Resolver):
def resolve(self, url, id, context):
return self.resolve_string(data['dtd_file'], context)
xmldoc = StringIO(data['xml_file'])
parser = etree.XMLParser(dtd_validation=True, load_dtd=True)
parser.resolvers.add(DTDResolver())
try:
tree = etree.parse(xmldoc, parser)
except etree.XMLSyntaxError as e:
# handle xml and validation errors
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