Works.
using explciite namespaces.
Fixed up prefix resolution.
Clean up instance loading.
Resolving the default namespace from the parent element seems to be a bad idea.
Fix name.
Set relevance.
Throw error on bad options to make tracking easier.
Pull old value to make debugging easier.
Remove stale properties and methods.
if for null Label.
Using an IEvaluationContextProvider to provide custom evaluation contexts for repeat children.
Change Selectable ID to be ObjectId.
Crappy version of sub-bind support.