NsContentName : INDENTIFIER
                  | NAMESPACEBEFORESLASH
                  | SLASH INDENTIFIER
                  | NsContentName SLASH INDENTIFIER

def p_NsContentName(p):
    '''
    NsContentName : INDENTIFIER
                  | NAMESPACEBEFORESLASH
                  | SLASH INDENTIFIER
                  | NsContentName SLASH INDENTIFIER
    '''
    if len(p) == 2:
        p[0] = NsContentName(None, p[1])
    elif len(p) == 3:
        p[0] = NsContentName(None, p[1] + p[2])
    else:
        p[0] = NsContentName(p[1], p[2] + p[3])