make NXsample(_component) extend NXcomponent

base_classes/NXobject.nxdl.xml

@@ -198,16 +198,16 @@
 	</field>
 	<attribute name="default">
         <doc>
-            .. index:: plotting
+			.. index:: plotting
 
-            Declares which child group contains a path leading
-            to a :ref:`NXdata` group or a group using a base class
+			Declares which child group contains a path leading
+			to a :ref:`NXdata` group or a group using a base class
 			extending :ref:`NXdata`.
 
-            It is recommended (as of NIAC2014) to use this attribute
-            to help define the path to the default dataset to be plotted.
-            See https://www.nexusformat.org/2014_How_to_find_default_data.html
-            for a summary of the discussion.
+			It is recommended (as of NIAC2014) to use this attribute
+			to help define the path to the default dataset to be plotted.
+			See https://www.nexusformat.org/2014_How_to_find_default_data.html
+			for a summary of the discussion.
         </doc>
     </attribute>
 </definition>

base_classes/NXsample.nxdl.xml

@@ -25,7 +25,7 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://definition.nexusformat.org/nxdl/3.1 ../nxdl.xsd"
 	name="NXsample" 
-	type="group" extends="NXobject"
+	type="group" extends="NXcomponent"
 	>
 
 	<symbols>
@@ -386,23 +386,5 @@
            This group describes the shape of the sample
           </doc>
         </group>
-    <field name="depends_on" type="NX_CHAR">
-        <doc>
-            NeXus positions components by applying a set of translations and rotations
-            to apply to the component starting from 0, 0, 0. The order of these operations
-            is critical and forms what NeXus calls a dependency chain. The depends_on
-            field defines the path to the top most operation of the dependency chain or the
-            string "." if located in the origin. Usually these operations are stored in a
-            NXtransformations group. But NeXus allows them to be stored anywhere.
-        </doc>
-    </field>
-    <group type="NXtransformations">
-        <doc>
-            This is the group recommended for holding the chain of translation
-            and rotation operations necessary to position the component within
-            the instrument. The dependency chain may however traverse similar groups in
-            other component groups.
-        </doc>
-    </group>
 </definition>
 

base_classes/NXsample_component.nxdl.xml

@@ -25,7 +25,7 @@
 	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://definition.nexusformat.org/nxdl/3.1 ../nxdl.xsd"
 	name="NXsample_component" 
-	type="group" extends="NXobject"
+	type="group" extends="Nxcomponent"
 	>
 
 	<symbols>
@@ -139,22 +139,4 @@
 	<group name="transmission" type="NXdata">
 		<doc>As a function of Wavelength</doc>
 	</group>
-	    <field name="depends_on" type="NX_CHAR">
-        <doc>
-            NeXus positions components by applying a set of translations and rotations
-            to apply to the component starting from 0, 0, 0. The order of these operations
-            is critical and forms what NeXus calls a dependency chain. The depends_on
-            field defines the path to the top most operation of the dependency chain or the
-            string "." if located in the origin. Usually these operations are stored in a
-            NXtransformations group. But NeXus allows them to be stored anywhere.
-        </doc>
-    </field>
-    <group type="NXtransformations">
-        <doc>
-            This is the group recommended for holding the chain of translation
-            and rotation operations necessary to position the component within
-            the instrument. The dependency chain may however traverse similar groups in
-            other component groups.
-        </doc>
-    </group>
 </definition>