modified: data_model.md

src/docs/data_model.md

@@ -3,13 +3,20 @@ title: "Data Model"
 ---
 
 
-## PODIO  
+## [eicd](https://eic.phy.anl.gov/eicd) - EIC Data Model
 
-- Eicweb fork: https://eicweb.phy.anl.gov/EIC/podio
-- AIDAsoft repo: https://github.com/AIDASoft/podio
+The entire data model used (minus dd4pod) is defined in a single yaml file.
+This file is processed by a tool called [podio](https://github.com/AIDASoft/podio) to generate the c++ code.
+It can easily stamp out code in any language because under the hood podio uses `jinja2` templates to define the specific output files.
 
-## LCIO2 
 
-[Defined in yaml 
-file](https://eicweb.phy.anl.gov/EIC/podio/blob/master/lcio2/lcio-edm.yaml) 
-which is used to generate C++ library.
+
+## dd4pod
+
+ This is the output data model from `npsim` which is a slightly modified `ddsim`.
+ The dd4pod data model emulates the default DD4hep output data structures but implements the model via `podio`.
+ `dd4pod` is shipped in the [npdet](https://eic.phy.anl.gov/npdet) libraries.
+ 
+
+- AIDAsoft repo: 
+