Generate spec docs for sbml

Author: pgleeson

.gitignore

@@ -163,3 +163,4 @@ cython_debug/
 .idea/
 /examples/document.specification.bson
 /examples/neuroml2/hello_world.v.dat
+/examples/sbml/example_sbml_test.xml

docs/sphinx/source/api/Contributors.md

@@ -3,7 +3,7 @@
 # Modelspec contributors
 
 This page list names and Github profiles of contributors to Modelspec, listed in no particular order.
-This page is generated periodically, most recently on 2023-09-18.
+This page is generated periodically, most recently on 2023-09-19.
 
 - Padraig Gleeson ([@pgleeson](https://github.com/pgleeson))
 - Manifest Chakalov  ([@mqnifestkelvin](https://github.com/mqnifestkelvin))

examples/COMBINE.md

@@ -0,0 +1,20 @@
+# COMBINE standards in modelspec
+
+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).
+
+## SBML
+
+work towards an API for [SBML](https://www.sbml.org/) can be found [here](SBML).
+
+## CellML
+
+TODO...
+
+## SED-ML
+
+TODO...
+