<enumeration value="left" />
<enumeration value="noleft" />
<enumeration value="split" />
<enumeration value="stop" />
<enumeration value="unctrl" />
<enumeration value="yield" />
<enumeration value="protect" />
<enumeration value="permit" />
<enumeration value="protpmt" />
<enumeration value="stopyld" />
<enumeration value="yldstop" />
<enumeration value="prtpmt" />
<enumeration value="pmtprt" />
<enumeration value="permpp" />
<enumeration value="ppperm" />
<enumeration value="protpp" />
<enumeration value="ppprot" />
<enumeration value="pmtprot" />
<enumeration value="pprperm" />
<enumeration value="protppr" />
<enumeration value="pprprot" />
<enumeration value="prpppr" />
<enumeration value="pprprp" />
</restriction>