def __init__(self, data):
"""
The data holds the characters.
Example:
html = Html()
data = '<body><em>alpha</em></body>'
dom = html.feed(data)
x = dom.fst('em')
x.append(Data('\nbeta'))
It outputs.
<body ><em >alpha
beta</em></body>
"""
Root.__init__(self, DATA)
self.data = data
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