Firebird schema contains wrong CanBeNull="true" when the domain used for column says that it can not be null.

[GoogleCodeExporter]

What steps will reproduce the problem?
1. In firebird database create table with fields as nullable (just firgive to 
add 'NOT NULL', but use domain which says that it is can not be null.
2. The generated dbml will contain wrong CanBeNull="true"

What is the expected output? What do you see instead?
Should be CanBeNull="false"

What version of the product are you using? On what operating system?
2.0.1
win8 x64

Please provide any additional information below.
Attached patch to fix that problem.

Original issue reported on code.google.com by fov...@gmail.com on 20 Nov 2013 at 7:20

Attachments:

• [domains not null in Firebird.patch](https://storage.googleapis.com/google-code-attachments/dblinq2007/issue-340/comment-0/domains not null in Firebird.patch)