AbstractSymbol 

AbstractSymbol is a simple type, i.e. a string token. Concrete subclasses of character
blocks will restrict AbstractSymbol to something sensible such as a regular expression
of IUPAC symbols, a range of integer values, and so on.

Simple Type Information

Used By

Simple Types AAToken, DNAToken, RNAToken

Source 

<xs:simpleType name="AbstractSymbol">
  <xs:annotation>
    <xs:documentation>AbstractSymbol is a simple type, i.e. a string token. Concrete subclasses of character blocks will restrict AbstractSymbol to something sensible such as a regular expression of IUPAC symbols, a range of integer values, and so on.</xs:documentation>
  </xs:annotation>
  <xs:restriction base="xs:string">
    <xs:whiteSpace value="preserve"/>
  </xs:restriction>
</xs:simpleType>