<xs:enumeration value="bit parameters"/>
<xs:enumeration value="bit type comment"/>
<xs:enumeration value="casing point comment"/>
<xs:enumeration value="chromatograph comment"/>
<xs:enumeration value="circulation system comment"/>
<xs:enumeration value="core interval comment"/>
<xs:enumeration value="drilling data comment"/>
<xs:enumeration value="gas peaks comment"/>
<xs:enumeration value="gas ratio comment"/>
<xs:enumeration value="general engineering comment"/>
<xs:enumeration value="lithlog comment"/>
<xs:enumeration value="LWD comment"/>
<xs:enumeration value="marker or formation top comment"/>
<xs:enumeration value="midnight depth date"/>
<xs:enumeration value="mud check comment"/>
<xs:enumeration value="mud data comment"/>
<xs:enumeration value="mudlog comment"/>
<xs:enumeration value="pressure data comment"/>
<xs:enumeration value="shale density comment"/>
<xs:enumeration value="short trip comment"/>
<xs:enumeration value="show report comment"/>
<xs:enumeration value="sidewall core comment"/>
<xs:enumeration value="sliding Interval"/>
<xs:enumeration value="steam still results comment"/>
<xs:enumeration value="survey comment"/>
<xs:enumeration value="temperature data comment"/>
<xs:enumeration value="temperature trend comment"/>
<xs:enumeration value="unknown"/>
<xs:enumeration value="wireline log comment"/>
</xs:restriction>