Substitutes the attributes (before they are passed to the Rule implementations's).
Digester will only call this method a second time once the original Attributes instance can be safely reused. The implementation is therefore free to reuse the same Attributes instance for all calls.
Attributes passed into Digester by the SAX parser, not null (butmay be empty)
@return Attributes to be passed to the Rule implementations. This method may pass backthe Attributes passed in. Not null but possibly empty.
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