Implemented suggestions from @lukaspie related to points mentioned in #…

…243

# Conflicts:
#	base_classes/NXchemical_composition.nxdl.xml
#	base_classes/NXfabrication.nxdl.xml
#	base_classes/NXfit_parameter.nxdl.xml
#	contributed_definitions/NXcorrector_ax.nxdl.xml
#	contributed_definitions/NXcorrector_cc.nxdl.xml
#	contributed_definitions/NXcorrector_cs.nxdl.xml
#	contributed_definitions/NXebeam_column.nxdl.xml
#	contributed_definitions/NXem.nxdl.xml
#	contributed_definitions/NXibeam_column.nxdl.xml
#	contributed_definitions/nyaml/NXcorrector_ax.yaml
#	contributed_definitions/nyaml/NXcorrector_cs.yaml
#	contributed_definitions/nyaml/NXebeam_column.yaml
#	contributed_definitions/nyaml/NXem.yaml
#	contributed_definitions/nyaml/NXibeam_column.yaml
#	manual/source/classes/contributed_definitions/em-structure.rst

base_classes/NXfit_parameter.nxdl.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version='1.0' encoding='UTF-8'?>
 <?xml-stylesheet type="text/xsl" href="nxdlformat.xsl"?>
 <!--
 # NeXus - Neutron and X-ray Common Data Format
@@ -21,35 +21,48 @@
 #
 # For further information, see http://www.nexusformat.org
 -->
-<definition xmlns="http://definition.nexusformat.org/nxdl/3.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" category="base" name="NXregistration" extends="NXobject" type="group" xsi:schemaLocation="http://definition.nexusformat.org/nxdl/3.1 ../nxdl.xsd">
+<definition xmlns="http://definition.nexusformat.org/nxdl/3.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" category="base" type="group" name="NXcomponent_em" extends="NXobject" xsi:schemaLocation="http://definition.nexusformat.org/nxdl/3.1 ../nxdl.xsd">
     <doc>
-         Describes image registration procedures.
+         Base class for components used in an electron microscope.
+
+         The electron microscope can be a real one or a simulated microscope.
     </doc>
+    <attribute name="depends_on" type="NX_CHAR">
+        <doc>
+             Specifies the position of the component by pointing to the last
+             transformation in the transformation chain that is defined
+             via the NXtransformations group.
+        </doc>
+    </attribute>
     <field name="applied" type="NX_BOOLEAN">
         <doc>
-             Has the registration been applied?
+             Was the component used?
         </doc>
     </field>
-    <field name="last_process" type="NX_CHAR">
+    <field name="name" type="NX_CHAR">
         <doc>
-             Indicates the name of the last operation applied in the NXprocess sequence.
+             Given name to the component.
+
+             Exemplar value stage, lens C1.
         </doc>
     </field>
-    <field name="depends_on" type="NX_CHAR">
+    <group name="fabrication" type="NXfabrication"/>
+    <group name="identifier" type="NXidentifier"/>
+    <field name="description" type="NX_CHAR">
         <doc>
-             Specifies the position by pointing to the last transformation in the
-             transformation chain in the NXtransformations group.
+             Ideally, use identifier to point to a resource which provides
+             further details of the component.
+
+             If such a resource does not exist or should not be used,
+             use this, though discouraged, free-text field to report
+             further details about the component.
         </doc>
     </field>
+    <group type="NXprogram"/>
     <group type="NXtransformations">
         <doc>
-             To describe the operations of image registration (combinations of rigid
-             translations and rotations)
+             Collection of axis-based translations and rotations to describe the
+             location and geometry of the component in the instrument.
         </doc>
     </group>
-    <field name="description" type="NX_CHAR">
-        <doc>
-             Description of the procedures employed.
-        </doc>
-    </field>
 </definition>

contributed_definitions/NXebeam_column.nxdl.xml

@@ -2,9 +2,9 @@
 <?xml-stylesheet type="text/xsl" href="nxdlformat.xsl"?>
 <!--
 # NeXus - Neutron and X-ray Common Data Format
-#
+# 
 # Copyright (C) 2014-2024 NeXus International Advisory Committee (NIAC)
-#
+# 
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
 # License as published by the Free Software Foundation; either

contributed_definitions/NXibeam_column.nxdl.xml

@@ -2,9 +2,9 @@
 <?xml-stylesheet type="text/xsl" href="nxdlformat.xsl"?>
 <!--
 # NeXus - Neutron and X-ray Common Data Format
-#
+# 
 # Copyright (C) 2014-2024 NeXus International Advisory Committee (NIAC)
-#
+# 
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
 # License as published by the Free Software Foundation; either

contributed_definitions/nyaml/NXcomponent_em.yaml

@@ -10,6 +10,9 @@ NXcomponent_em(NXobject):
       Specifies the position of the component by pointing to the last
       transformation in the transformation chain that is defined
       via the NXtransformations group.
+  applied(NX_BOOLEAN):
+    doc: |
+      Was the component used?
   name(NX_CHAR):
     doc: |
       Given name to the component.