MatroskaValue

class MatroskaValue(object):

    def __init__(self, value, target_type, target):
        self.value = value
        self.target_type = target_type
        self.target = target

        # Initialize this for nested tags
        self.values = {}

    def add_tag(self, key, value):
        values = self.values.get(key, [])
        values.append(value)

        self.values[key] = values

    def delete_tag(self, key):
        del self.values[key]