add in brief parsing stage update

composition/proposal.md

@@ -329,7 +329,8 @@ are more local.
 **Alternatives Considered for Reference Syntax**
 
 * Use `/` instead of `::`, and permit `../` for upwards references.
-    * This looks a bit more like a filesystem (more relevant to these semantics). However, there is inertia due to Gazebo's usage of `::`
+    * This looks a bit more like a filesystem (more relevant to these
+    semantics). However, there is inertia due to Gazebo's usage of `::`
     for composition, in both SDFormat files and for models (and IPC channels /
     topics in general).
 * Upwards references:
@@ -502,7 +503,7 @@ models, and `model://` URIs for Gazebo models.
 
 ##### 1.4.6 `//include/static`
 
-**TODO(eric)**: Reconsider this in future iterations of the proposal.
+**TODO(eric.cousineau)**: Reconsider this in future iterations of the proposal.
 
 This allows the `//model/static` element to be overridden and will affect
 *all* models transitively included via the `//include` element, and can *only*
@@ -966,6 +967,18 @@ There are seven phases for validating the kinematics data in a world:
         and the [SemanticPose::Resolve](https://github.com/osrf/sdformat/blob/sdformat9_9.2.0/include/sdf/SemanticPose.hh#L65-L73)
         function.
 
+#### Short-form modifications for Interface API
+
+*TODO(eric.cousineau): Factor into above steps.*
+
+* Load the SDFormat model DOM.
+* For each include:
+  * If non-SDFormat, directly load, record the `sdf::InterfaceModel`.
+  * If SDFormat-compatible, recursively load the DOM into nested models.
+    * For each nested model, directly load any nested non-SDFormat models.
+* Resolve frame graph.
+  * Reposture non-SDFormat models.
+
 ### Examples
 
 #### 1 Weld Arm and Gripper