Several new topics to the gbkb reference.

book/chapter-03-gbkb-reference.md

@@ -1,6 +1,39 @@
 # .gbkb Reference
 
+## Media Types
 
+There are several media types that can be used in .gbkb package folder.
+The table below shows the description of each one of them:
+
+| Folder   | File description                                                                                   |
+|----------|----------------------------------------------------------------------------------------------------|
+| tabular  | .csv, .tsv or any tabular file used as an pair of question/answer and an optional hierarchy.       |
+| images   | Images that can be used to enrich the answer to the user in the [Projector](glossary.md#projector) |
+| videos   | Videos used to answer questions made by users.                                                     |
+| subjects | List of images of subjects that can be trated by the bot.                                          |
+| articles | Articles in .md that will be presented instead of text-only answers.                               |
+
+## Using Videos
+
+## Answering questions as videos
+
+To display a video on the projector, just provide the Video URL to the desired question,
+instead of specifing an text answer in the column **answer**.
+The list of answers is a series of tabular files (.tsv, .csv, etc.) inside the **tabular** directory of the .gbkb.
+
+## Calling dialogs from .gbkb
+
+### Use Dialogs as answers instead of the default content
+
+To call a dialog just when an answer would provide the desired question, just
+use dialog:*dialogName* instead of specifing an text answer in the column
+**answer**. The list of answers is a series of tabular files (.tsv, .csv, etc.)
+inside the **tabular** directory of the .gbkb.
+
+### Associating a [Subject Menu Item](glossary.md#subject-menu-item) to a Dialog
+
+To call a dialog just when an answer would provide the desired question, just
+use dialog:*dialogName* instead of specifing an text answer.
 
 ## How To
 

book/glossary.md

@@ -1,3 +1,6 @@
 # Glossary
 
-
+| Term              | Description                                                                 |
+|-------------------|-----------------------------------------------------------------------------|
+| Subject Menu Item | An item that is shown to the user when a request of known subjects is done. |
+| Projector         | A canvas that expresses the current conversation graphically.               |