<
xs:restriction base="
xs:string">
<xs:enumeration value="alluvial fan"/>
<xs:enumeration value="basinal carbonate"/>
<xs:enumeration value="basinal siliceous"/>
<xs:enumeration value="carbonate"/>
<xs:enumeration value="cave"/>
<xs:enumeration value="channel"/>
<xs:enumeration value="channel lag"/>
<xs:enumeration value="coarse channel fill"/>
<xs:enumeration value="coastal"/>
<xs:enumeration value="crater lake"/>
<xs:enumeration value="crevasse splay"/>
<xs:enumeration value="deep subtidal"/>
<xs:enumeration value="deep subtidal ramp"/>
<xs:enumeration value="deep subtidal shelf"/>
<xs:enumeration value="deltaic"/>
<xs:enumeration value="delta front"/>
<xs:enumeration value="delta plain"/>
<xs:enumeration value="dry floodplain"/>
<xs:enumeration value="dune"/>
<xs:enumeration value="estuarine"/>
<xs:enumeration value="eolian"/>
<xs:enumeration value="fissure fill"/>
<xs:enumeration value="floodplain"/>
<xs:enumeration value="fluvial"/>
<xs:enumeration value="fluvial-deltaic"/>
<xs:enumeration value="fluvial-lacustrine"/>
<xs:enumeration value="foreshore"/>
<xs:enumeration value="glacial"/>
<xs:enumeration value="interdistributary bay"/>
<xs:enumeration value="interdune"/>
<xs:enumeration value="karst"/>
<xs:enumeration value="lacustrine"/>
<xs:enumeration value="lagoonal"/>
<xs:enumeration value="levee"/>
<xs:enumeration value="loess"/>
<xs:enumeration value="marginal marine"/>
<xs:enumeration value="marine"/>
<xs:enumeration value="offshore"/>
<xs:enumeration value="offshore ramp"/>
<xs:enumeration value="offshore shelf"/>
<xs:enumeration value="open shallow subtidal"/>
<xs:enumeration value="paralic"/>
<xs:enumeration value="peritidal"/>
<xs:enumeration value="pond"/>
<xs:enumeration value="prodelta"/>
<xs:enumeration value="reef or bioherm"/>
<xs:enumeration value="shallow subtidal"/>
<xs:enumeration value="shoreface"/>
<xs:enumeration value="shore transition zone"/>
<xs:enumeration value="sinkhole"/>
<xs:enumeration value="slope"/>
<xs:enumeration value="swamp"/>
<xs:enumeration value="restricted shallow subtidal"/>
<xs:enumeration value="sand shoal"/>
<xs:enumeration value="tar"/>
<xs:enumeration value="terrestrial"/>
<xs:enumeration value="wet floodplain"/>
</
xs:restriction>