"finite-length sequence" exact semantic

  For all the XSD-1.0 decimal derived types the lexical representation
is defined using something like (e.g for byte):

  http://www.w3.org/TR/xmlschema-2/#byte
   "byte has a lexical representation consisting of an optional sign followed
    by a finite-length sequence of decimal digits (#x30-#x39). If the sign is
    omitted, "+" is assumed. For example: -1, 0, 126, +100."

Similary it is used for string:
   http://www.w3.org/TR/xmlschema-2/#string
    "...The ·value space· of string is the set of finite-length sequences of 
     characters..."

from my math antique background an empty sequence is a finite-length sequence.
But I could be wrong, I doubt it's what expect by the authors since the
example of minLength explicitely shows how to avoid empty strings ...
   http://www.w3.org/TR/xmlschema-2/#rf-minLength

So I guess either:
  - "finite-length sequence" is not used in a consistent way in the spec
  - or all those definitions for decimal and derived types need to specify
    that sequence to be non-empty

Can someone confirm "" need to be rejected, and if not what the value should
be associated (0 ?),

I checked http://www.w3.org/2004/03/xmlschema-errata and it's empty, really ??

Daniel

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