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
+ is used as its input.
+
@param rdclass: The rdata class
@type rdclass: int
@param rdtype: The rdata type
@type rdtype: int
- @param tok: The tokenizer
- @type tok: dns.tokenizer.Tokenizer
+ @param tok: The tokenizer or input text
+ @type tok: dns.tokenizer.Tokenizer or string
@param origin: The origin to use for relative names
@type origin: dns.name.Name
@param relativize: Should names be relativized?