On 5/1/15, 8:20, "Tony Finch" <d...@dotat.at> wrote: >Eric Brunner-Williams <e...@abenaki.wabanaki.net> wrote: > >> i'd like to think of it as a sequence of bits having having no infix >>dots and >> having no semantics, e.g., directionality, arising externally to itself. > >Dots are allowed in labels but have to be escaped in the presentation >format. RFC 1035 section 5.1: > > \X where X is any character other than a digit (0-9), is > used to quote that character so that its special meaning > does not apply. For example, "\." can be used to place > a dot character in a label.
Had the same thought too. The context in which infix dots and directionality come to light is in the registration of names, particularly IDNs. But that is not a universal concern in when it comes to defining a label. A label is a component of a domain name. That applies to the wire format or the printed representation. On the wire it is an octet indicating type and length followed by the data. In printed form it is the stuff between unescaped separators [which happen to be '.' now/but don't have to be].
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