public bool isINumber()
{
IList<XRI3SubSegment> subSegments = this.authority.SubSegments;
// all subsegments must be persistent
for (int i = 0; i < subSegments.Count; i++)
{
XRI3SubSegment subSegment = subSegments[i];
if (!subSegment.isPersistent())
return (false);
}
return (true);
}