Add descriptions to mesh operators.

smtk/extension/vtk/operators/BathymetryOperator.sbt

@@ -4,6 +4,15 @@
   <Definitions>
     <!-- Operator -->
     <AttDef Type="apply bathymetry" Label="Mesh - Apply Bathymetry" BaseType="operator">
+      <BriefDescription>
+        Add or Remove elevation from a model or mesh.
+      </BriefDescription>
+      <DetailedDescription>
+        &lt;p&gt;Add or Remove elevation from a model or mesh.
+        &lt;p&gt;This operator modifies the z-coordinate of a model, a
+        mesh or both a model and a mesh according to an auxiliary
+        geometry. The elevation data can be applied or removed.
+      </DetailedDescription>
       <ItemDefinitions>
 
         <String Name="operation" Label="Operation" Version="0" AdvanceLevel="0" NumberOfRequiredValues="1">

smtk/mesh/operators/DeleteMesh.sbt

@@ -7,8 +7,15 @@
       <ItemDefinitions>
         <MeshEntity Name="mesh" NumberOfRequiredValues="1" Extensible="true" />
       </ItemDefinitions>
+      <BriefDescription>
+        Remove a mesh from the model instance.
+      </BriefDescription>
+      <DetailedDescription>
+        &lt;p&gt;Remove a mesh from the model instance.
+        &lt;p&gt;This operator removes meshes from the application's
+        memory. It does not remove meshes from disk.
+      </DetailedDescription>
     </AttDef>
-
     <!-- Result -->
     <AttDef Type="result(delete mesh)" BaseType="result">
       <ItemDefinitions>

smtk/mesh/operators/ExportMesh.sbt

@@ -4,6 +4,17 @@
   <Definitions>
     <!-- Operator -->
     <AttDef Type="export mesh" Label="Mesh - Export" BaseType="operator">
+      <BriefDescription>
+        Export a mesh to disk.
+      </BriefDescription>
+      <DetailedDescription>
+        &lt;p&gt;Export a mesh to disk.
+        &lt;p&gt;This operator creates a file representing the
+        selected mesh and saves it to disk. The created file is
+        readable by this application, but the resulting
+        mesh is not guaranteed to contain all of the information from
+        the original mesh.
+      </DetailedDescription>
       <ItemDefinitions>
         <MeshEntity Name="mesh" NumberOfRequiredValues="1" Extensible="true" />
         <File Name="filename" NumberOfRequiredValues="1" ShouldExist="false"

smtk/mesh/operators/InterpolateMesh.sbt

@@ -5,6 +5,18 @@
     <!-- Operator -->
     <AttDef Type="interpolate mesh"
             Label="Mesh - Interpolate" BaseType="operator">
+      <BriefDescription>
+        Create a field on mesh nodes/elements from
+        interpolated 2-dimensional data.
+      </BriefDescription>
+      <DetailedDescription>
+        &lt;p&gt;Create a field on mesh nodes/elements from
+        interpolated 2-dimensional data.
+        &lt;p&gt;This operator accepts as input two-dimensional points
+        with associated scalar values, and interpolates these values
+        onto either the points or the cells of the mesh. The input
+        points can be inserted manually or read from a CSV file.
+      </DetailedDescription>
       <ItemDefinitions>
         <MeshEntity Name="mesh" Label="Mesh" NumberOfRequiredValues="1" Extensible="true" >
           <BriefDescription>The mesh to elevate.</BriefDescription>

smtk/mesh/operators/WriteMesh.sbt

@@ -4,6 +4,17 @@
   <Definitions>
     <!-- Operator -->
     <AttDef Type="write mesh" Label="Mesh - Save" BaseType="operator">
+      <BriefDescription>
+        Write a mesh to disk.
+      </BriefDescription>
+      <DetailedDescription>
+        &lt;p&gt;Write a mesh to disk.
+        &lt;p&gt;This operator creates a file representing the
+        selected mesh and saves it to disk. The created file is
+        readable by this application, and the resulting
+        mesh is guaranteed to contain all of the information from
+        the original mesh.
+      </DetailedDescription>
       <ItemDefinitions>
         <MeshEntity Name="mesh" NumberOfRequiredValues="1" Extensible="true" />
         <File Name="filename" NumberOfRequiredValues="1" ShouldExist="false"