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def initialize stream
if stream.kind_of? String
@source = Source.new stream
elsif stream.kind_of? IO
@source = IOSource.new stream
elsif stream.kind_of? Source
@source = stream
else
raise "#{stream.type} is not a valid input stream. It must be \n"+
"either a String, IO, or Source."
end
@closed = nil
@document_status = nil
@tags = []
@stack = []
@entities = []
end
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