Updated documentation

The paths to the documentation hadn't been updated after reorganizing the namespaces (fc23a61)—whoops! Nor had the new `TopicMultiMap` or `ReadOnlyTopicMultiMap` classes been accounted for. Both are now factored into the `README.md`. While I was at it, I now account for specialized collections under a new "Specialty Collections" subheading.

Author: JeremyCaney

OnTopic/README.md

@@ -13,6 +13,7 @@ The `OnTopic` assembly represents the core domain layer of the OnTopic library.
 - [Implementation](#implementation)
 - [Extension Methods](#extension-methods)
 - [Collections](#collections)
+  - [Specialty Collections](#specialty-collections)
   - [Editor](#editor-1)
 - [View Models](#view-models) 
 
@@ -32,33 +33,37 @@ Out of the box, the OnTopic library contains two specially derived topics for su
 - **[`ITopicRepository`](Repositories/ITopicRepository.cs)**: Defines the data access layer interface, with `Load()`, `Save()`, `Delete()`, `Move()`, and `Rollback()` methods.
 - **[`ITopicMappingService`](Mapping/README.md)**: Defines interface for a service that can convert a `Topic` class into any arbitrary data transfer object based on predetermined conventions—or vice versa (via the `IReverseTopicMappingService`. 
 - **[`IHierarchicalTopicMappingService<T>`](Mapping/Hierarchical/README.md)**: Defines an interface for applying the `ITopicMappingService` to hierarchical data with constraints on depth. Used primarily for mapping navigation, such as in the [`NavigationTopicViewComponentBase<T>`](../OnTopic.AspNetCore.Mvc/Components/NavigationTopicViewComponentBase{T}.cs).
-- **[`ITypeLookupService`](ITypeLookupService.cs)**: Defines the interface that can identify `Type` objects based on a `GetType(typeName)` query. Used by e.g. `ITopicMappingService` to find corresponding `TopicViewModel` classes to map to.
+- **[`ITypeLookupService`](lookup/ITypeLookupService.cs)**: Defines the interface that can identify `Type` objects based on a `GetType(typeName)` query. Used by e.g. `ITopicMappingService` to find corresponding `TopicViewModel` classes to map to.
 
 ## Implementations
 - **[`TopicMappingService`](Mapping/README.md)**: A default implementation of the `ITopicMappingService`, with built-in conventions that should address that majority of mapping requirements. This also includes a number of attributes for annotating view models with hints that the `TopicMappingService` can use in populating target objects.
   - **[`CachedTopicMappingService`](Mapping/README.md)**: Provides an optional caching layer for the `TopicMappingService`—or any `ITopicMappingService` implementation.
 - **[`ReverseTopicMappingService`](Mapping/Reverse/README.md)**: A default implementation of the `IReverseTopicMappingService`, honoring similar conventions and attribute hints as the `TopicMappingService`.
 - **[`HierarchicalTopicMappingService<T>`](Mapping/Hierarchical/README.md)**: A default implementation of the `IHierarchicalTopicMappingService<T>`, which accepts an `ITopicMappingService` for mapping each individual node in the hierarchy.
   - **[`CachedHierarchicalTopicMappingService<T>`](Mapping/Hierarchical/README.md)**: Provides an optional caching layer for the `HierarchicalTopicMappingService`—or any `IHierarchicalTopicMappingService` implementation.
-- **[`StaticTypeLookupService`](StaticTypeLookupService.cs)**: A basic implementation of the `ITypeLookupService` interface that allows types to be explicitly registered; useful when a small number of types are expected.
-  - **[`DynamicTypeLookupService`](Reflection/DynamicTypeLookupService.cs)**: A reflection-based implementation of the `ITypeLookupService` interface that looks up types from all loaded assemblies based on a `Func<Type, bool>` delegate.
-    - **[`DynamicTopicLookupService`](Reflection/DynamicTopicLookupService.cs)**: A version of `DynamicTypeLookupService` that returns all classes that derive from `Topic`; this is the default implementation for `TopicFactory`.
-    - **[`DynamicTopicViewModeLookupService`](Reflection/DynamicTopicViewModelLookupService.cs)**: A version of `DynamicTypeLookupService` that returns all classes that end with `TopicViewModel`; this is useful for the `TopicMappingService`.
-    - **[`DynamicTopicBindingModelLookupService`](Reflection/DynamicTopicBindingModelLookupService.cs)**: A version of `DynamicTypeLookupService` that returns all classes that implement `ITopicBindingModel`; this is useful for the `ReverseTopicMappingService`.
+- **[`StaticTypeLookupService`](Lookup/StaticTypeLookupService.cs)**: A basic implementation of the `ITypeLookupService` interface that allows types to be explicitly registered; useful when a small number of types are expected.
+  - **[`DynamicTypeLookupService`](Lookup/DynamicTypeLookupService.cs)**: A reflection-based implementation of the `ITypeLookupService` interface that looks up types from all loaded assemblies based on a `Func<Type, bool>` delegate.
+    - **[`DynamicTopicLookupService`](Lookup/DynamicTopicLookupService.cs)**: A version of `DynamicTypeLookupService` that returns all classes that derive from `Topic`; this is the default implementation for `TopicFactory`.
+    - **[`DynamicTopicViewModeLookupService`](Lookup/DynamicTopicViewModelLookupService.cs)**: A version of `DynamicTypeLookupService` that returns all classes that end with `TopicViewModel`; this is useful for the `TopicMappingService`.
+    - **[`DynamicTopicBindingModelLookupService`](Lookup/DynamicTopicBindingModelLookupService.cs)**: A version of `DynamicTypeLookupService` that returns all classes that implement `ITopicBindingModel`; this is useful for the `ReverseTopicMappingService`.
 
 ## Extension Methods
 - **[`Querying`](Querying/TopicExtensions.cs)**: The `TopicExtensions` class exposes optional extension methods for querying a topic (and its descendants) based on attribute values. This includes the useful `Topic.FindAll(Func<Topic, bool>)` method for querying an entire topic graph and returning topics validated by a predicate.
-- **[`Attributes`](Attributes/AttributeValueCollectionExtensions.cs)**: The `AttributeValueCollectionExtensions` class exposes optional extension methods for strongly typed access to the [`AttributeValueCollection`](Collections/AttributeValueCollection.cs). This includes e.g., `GetBooleanValue()` and `SetBooleanValue()`, which takes care of the conversion to and from the underlying `string`value type.
+- **[`Attributes`](Attributes/AttributeValueCollectionExtensions.cs)**: The `AttributeValueCollectionExtensions` class exposes optional extension methods for strongly typed access to the [`AttributeValueCollection`](Attributes/AttributeValueCollection.cs). This includes e.g., `GetBooleanValue()` and `SetBooleanValue()`, which takes care of the conversion to and from the underlying `string`value type.
 
 ## Collections
 In addition to the above key classes, the `OnTopic` assembly contains a number of specialized collections. These include:
 - **[`TopicCollection{T}`](Collections/TopicCollection{T}.cs)**: A `KeyedCollection` of a `Topic` (or derivative) keyed by `Id` and `Key`.
   - **[`TopicCollection`](Collections/TopicCollection.cs)**: A `KeyedCollection` of `Topic` keyed by `Id` and `Key`.
-    - **[`NamedTopicCollection`](Collections/NamedTopicCollection.cs)**: Provides a unique name to a `TopicCollection` so it can be keyed as part of a collection-of-collections.
 - **[`ReadOnlyTopicCollection{T}`](Collections/ReadOnlyTopicCollection{T}.cs)**: A read-only `KeyedCollection` of a `Topic` (or derivative) keyed by `Id` and `Key`.
   - **[`ReadOnlyTopicCollection`](Collections/ReadOnlyTopicCollection.cs)**: A read-only `KeyedCollection` of `Topic` keyed by `Id` and `Key`.
-- **[`TopicRelationshipMultiMap`](Collections/TopicRelationshipMultiMap.cs)**: A `KeyedCollection` of `NamedTopicCollection` objects, keyed by `Name`, thus providing a collection-of-collections.
-- **[`AttributeValueCollection`](collections/AttributeValueCollection.cs)**: A `KeyedCollection` of `AttributeValue` instances keyed by `AttributeValue.Key`.
+- **[`TopicMultiMap`](Collections/TopicMultiMap.cs)**: Provides a multi-map (or collection-of-collections) for topics organized by a collection name.
+  - **[`ReadOnlyTopicMultiMap`](Collections/ReadOnlyTopicMultiMap.cs)**: A read-only interface to the `TopicMultiMap`, thus allowing simple enumeration of the collection withouthout exposing any write access.
+
+### Specialty Collections
+- **[`TopicRelationshipMultiMap`](References/TopicRelationshipMultiMap.cs)**: A `KeyedCollection` of `NamedTopicCollection` objects, keyed by `Name`, thus providing a collection-of-collections.
+- **[`TopicRelationshipMultiMap`](References/TopicRelationshipMultiMap.cs)**: A `KeyedCollection` of `NamedTopicCollection` objects, keyed by `Name`, thus providing a collection-of-collections.
+- **[`AttributeValueCollection`](attributes/AttributeValueCollection.cs)**: A `KeyedCollection` of `AttributeValue` instances keyed by `AttributeValue.Key`.
 
 ### Editor
 The following are intended to provide support for the Editor domain objects, `ContentTypeDescriptor` and `AttributeDescriptor`.