Update COMBINE specs docs

Author: pgleeson

examples/COMBINE.md

@@ -1,14 +1,24 @@
 # COMBINE standards in modelspec
 
+![combine](images/combine.png)
+
 To illustrate the utility of modelspec, and to create a uniform, compatible set of APIs across a diverse range of model specification formats, we are investigating the [COMBINE set of standards in computational biology](https://co.mbine.org/standards/), and attempting to express these formats in modelspec.
 
 ## NeuroML
 
-A preliminary version of an API for [NeuroML2](https://docs.neuroml.org/Userdocs/NeuroMLv2.html) can be found [here](NeuroML).
+![neuroml](images/neuroml.png)
+
+A preliminary version of an API for [NeuroML2](https://docs.neuroml.org/Userdocs/NeuroMLv2.html) can be found [here](neuroml2). This allows generation of NeuroML2 models using the modelspec based API, saving as valid XML, as well as JSON, YAML and BSON equivalents. See [neuroml2_spec.py](neuroml2/neuroml2_spec.py).
+
+[NeuroMLlite](https://github.com/NeuroML/NeuroMLlite) already uses modelspec as its primary specification format. See [here](https://github.com/NeuroML/NeuroMLlite/blob/master/neuromllite/__init__.py).
 
 ## SBML
 
-work towards an API for [SBML](https://www.sbml.org/) can be found [here](SBML).
+![combine](images/sbml.png)
+
+Work towards an API for [SBML](https://www.sbml.org/) can be found [here](sbml).
+
+An example of an SBML file generated from this is [here](sbml/test_minimal_example.xml).
 
 ## CellML
 
@@ -17,4 +27,3 @@ TODO...
 ## SED-ML
 
 TODO...
-

examples/images/combine.png

@@ -2263,4 +2263,3 @@ XHTML field of SBase
 
 
 </table>
-

examples/images/neuroml.png

@@ -882,4 +882,3 @@ Allowed field    Data Type    Description
 **xmlns**        str          str fixed "http://www.w3.org/1999/xhtml"
 **content**      str          str valid XHTML
 ===============  ===========  ========================================
-

examples/images/sbml.png

@@ -1003,4 +1003,4 @@
             }
         }
     }
-}
+}