Version 1.4.0

• Properties whose values are null are now always serialized with a value attribute. Thanks to @southernprogrammer for reporting this issue. See the Null text documentation in the README for more information.

Before (1.3.1)

<log4net:properties>
  <log4net:data name="key" />
</log4net:properties>

After (1.4.0)

<log4net:properties>
  <log4net:data name="key" value="(null)" />
</log4net:properties>