adding use case diagram and bitemporal section to userguide

docs/dc-overview.md

@@ -20,3 +20,9 @@ There are 5 roles identified for users of the Data Controller:
 3. *Approver*.  An approver accepts / rejects proposed changes to data under their control. If accepted, the change is applied to the target table.
 4. *Auditor*.  An auditor has the ability to review the [history](dc-userguide.md#history) of changes to a particular table.
 5. *Administrator*.  An administrator has the ability to add new [tables](dcc-tables.md) to the Data Controller, and to configure the security settings (at metadata group level) as required.
+
+## Use Case Diagram
+
+There are five roles (Viewer, Editor, Approver, Auditor, Administrator) which correspond to 5 primary use cases (View Table, Edit Table, Approve Change, View Change History, Configure Table)
+
+<img src="/img/dcu-usecase.svg" height="350" style="border:3px solid black" >

docs/dc-userguide.md

@@ -51,6 +51,10 @@ New rows can be added using the right click context menu, or the 'Add Row' butto
 When ready to submit, hit the SUBMIT button and enter a reason for the change.  The owners of the data are now alerted (so long as their email addresses are in metadata) with a link to the approve screen.
 If you are also an approver you can approve this change yourself.
 
+#### BiTemporal Tables
+
+The Data Controller only permits BiTemporal data uploads at a single point in time - so for convenience, when viewing data in the edit screen, only the most recent records are displayed.  To edit earlier records, either use file upload, or apply a filter.
+
 ### Submitted
 This page shows a list of the changes you have submitted (that are not yet approved).
 
@@ -60,8 +64,3 @@ This shows the list of changes that have been submitted to you (or your groups)
 ### History
 View the list of changes to each table, who made the change, when, etc.
 
-## Use Case Diagram
-
-There are four Actors (Viewer, Editor, Approver, Auditor) and 3 primary use cases (View Table, Edit Table, Approve Change, View Change History)
-
-<img src="/img/dcu-usecase.svg" height="350" style="border:3px solid black" >

docs/dcu-fileupload.md

@@ -1,21 +1,24 @@
 # Data Controller for SAS: File Uploads
 
-Files can be uploaded via the Editor interface - first choose the library and table, then click "Upload".
-
+Files can be uploaded via the Editor interface - first choose the library and table, then click "Upload".  Currently only CSV files are supported, although these can be provided with non standard delimiters (such as semicolon).
 
 <img src="/img/dcu-files1.png" height="350" style="border:3px solid black" >
 
 The following should be considered when uploading data in this way:
 
  - A header row (with variable names) is required
- - Variable names must match the target
+ - Variable names must match the target (not case sensitive).  An easy way to ensure this is to download the data from Viewer and use this as a template.
  - Duplicate variable names are not permitted
  - Missing columns are not permitted
  - Additional columns are ignored
  - The order of variables does not matter
- - The delimiter is extracted from the header row (so for `var1;var2;var3` the delimeter would be assumed to be a semicolon)
- - The above assumes the delimeter is the first special character! so `var,1;var2;var3` would fail
- - The following characters should not be used as delimeters: `"' ` (doubleqoute, quote, space)
+ - The delimiter is extracted from the header row - so for `var1;var2;var3` the delimeter would be assumed to be a semicolon
+ - The above assumes the delimiter is the first special character! So `var,1;var2;var3` would fail
+ - The following characters should not be used as delimiters
+    - doublequote
+    - quote
+    - space
+    - underscore
 
 When loading dates, be aware that the data controller makes use of the `ANYDTDTE` and `ANYDTDTTME` informats.
 This means that uploaded date / datetime values should be unambiguous (eg `01FEB1942` vs `01/02/42`) to avoid confusion - as the latter could be interpreted as `02JAN2042` depending on your locale and options `YEARCUTOFF` settings.