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@var _rdata_modules: A dictionary mapping a (rdclass, rdtype) tuple to
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@type _rdata_modules: dict
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default is 'dns.rdtypes'.  Changing this value will break the library.
@type _module_prefix: string
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        @param origin: The origin to use for relative names
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        @type current: int
        @param rdlen: The length of the wire-format rdata
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    Once a class is chosen, its from_text() class method is called
    with the parameters to this function.

    If I{tok} is a string, then a tokenizer is created and the string
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    @type rdclass: int
    @param rdtype: The rdata type
    @type rdtype: int
    @param tok: The tokenizer or input text
    @type tok: dns.tokenizer.Tokenizer or string
    @param origin: The origin to use for relative names
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    @param rdclass: The rdata class
    @type rdclass: int
    @param rdtype: The rdata type
    @type rdtype: int
    @param wire: The wire-format message
    @type wire: string
    @param current: The offet in wire of the beginning of the rdata.
    @type current: int
    @param rdlen: The length of the wire-format rdata
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