diff --git a/applications/NXxas_new.nxdl.xml b/applications/NXxas_new.nxdl.xml
index 1c2df512ee..1892b7720f 100644
--- a/applications/NXxas_new.nxdl.xml
+++ b/applications/NXxas_new.nxdl.xml
@@ -3,7 +3,7 @@
+
+
+ In total fluorescence yield (TFY), the absorption coefficient :math:`\mu(E)` is
+ proportional to the ratio of the intensity of the emitted fluorescence
+ :math:`I_f` and the incident beam :math:`I_0`:
+
+ .. math:: \mu(E) \propto I_f/I_0
+
+ where :math:`I_f` is the intensity of the fluorescence emission, and :math:`I_0` is
+ the intensity of the incident beam.
+
+
+
+ Official NeXus NXDL schema to which this file conforms.
+
+
+
+
+
+
+ The absorption coefficient :math:`\mu(E)` defined above.
+
+
+
+
+
+
+
+ The intensity of the incident beam.
+
+
+
+
+
+
+
+ The intensity of the total fluorescence emission.
+
+
+
+
+
+
+
diff --git a/applications/NXxas_trans.nxdl.xml b/applications/NXxas_trans.nxdl.xml
new file mode 100644
index 0000000000..70ae96ca0a
--- /dev/null
+++ b/applications/NXxas_trans.nxdl.xml
@@ -0,0 +1,199 @@
+
+
+
+
+
+
+ The symbol(s) listed here will be used below to coordinate datasets
+ with the same shape.
+
+
+ Number of energy data points
+
+
+ Number of electronic transitions
+
+
+
+ In transmission, the linear attenuation coefficient or absorption
+ coefficient :math:`\mu(E)` is given by the Beer-Lambert law:
+
+ .. math:: \mu(E)t = -\ln(I/I_0)
+
+ where :math:`I` is the intensity of the transmitted beam, :math:`I_0` is
+ the intensity of the incident beam, and :math:`t` is the thickness of the
+ sample.
+
+ In many experimental setups, a third detector is can be placed downstream
+ of the main sample and a secondary reference material (typically a
+ high-purity metal foil) to record :math:`I_{ref}`, the reference
+ intensity, which is used to correct for beam fluctuations.
+
+
+
+ Official NeXus NXDL schema to which this file conforms.
+
+
+
+
+
+ Excited element
+
+
+ Absorption edge
+
+
+ Specify if the data commes from a calculation
+
+
+
+ The energy axis of the spectrum.
+
+
+
+
+
+
+
+ The absorption coefficient :math:`\mu(E)` defined above.
+
+
+
+
+
+
+
+ The errors associated with the intensity of the spectrum.
+
+
+
+
+
+
+
+ Descriptive name of the sample
+
+
+
+
+ Description on how :ref:`energy
+ </NXxas_new/ENTRY/energy-field>` and :ref:`intensity
+ </NXxas_new/ENTRY/intensity-field>` were obtained from the
+ raw data.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ The spacing between crystal planes of the reflection
+
+
+
+ Type or material of monochromating substance (Si,
+ Ge, Multilayer).
+
+
+
+ Miller indices (hkl) values of nominal reflection
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ Plot of the X-ray absorption intensity versus energy
+
+
+
+
+
+
+ Table like data structure common in the X-ray absorption
+ spectroscopy domain.
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+