Some headers to outline next sections

docs/intro/nwb.md

@@ -1 +1,20 @@
 # NWB Background
+
+## Components
+
+NWB is
+
+- nwb schema language
+- core schema + extensions 
+- hdmf + hdmf common
+- pynwb
+
+## NWB Schema Language
+
+### Design
+
+### Types
+
+## Core Schema
+
+## PyNWB

docs/intro/purpose.md

@@ -3,6 +3,10 @@
 If [pynwb](https://pynwb.readthedocs.io/en/stable/) already exists,
 why `nwb_linkml`?
 
+## A Stepping Stone...
+
+(word on how and why we are focusing on NWB as part of a larger project)
+
 ## Interoperable Schema Language
 
 **We want to make NWB a seed format in an interoperable, peer-to-peer

docs/intro/translation.md

@@ -1 +1,21 @@
 # Translation Strategy
+
+## NWB to LinkML
+
+### Structure
+
+### Names
+
+### Arrays
+
+## LinkML to Pydantic
+
+### Types
+
+### Metadata
+
+### Arrays
+
+## LinkML to Everything
+
+How to generalize to linked data triplets.