public StructureDefinition setBase(String value) { 
      if (Utilities.noString(value))
        this.base = null;
      else {
        if (this.base == null)
          this.base = new UriType();
        this.base.setValue(value);
      }
      return this;
    }
public StructureDefinition setBase ( String value ) { if ( Utilities . noString ( value ) ) this . base = null ; else { if ( this . base == null ) this . base = new UriType ( ) ; this . base . setValue ( value ) ; } return this ; }
@param value An absolute URI that is the base structure from which this set of constraints is derived.