Chaining configSource within configuration files

Question

Is it possible to 'nest' configSourced configuration? I receive an error: 'Unrecognized attribute 'configSource'. Note that attribute names are case-sensitive.'

Folder structure:

Root Folder
Config
    EnvironmentConfiguration
        DistributedCalls.config
    UmbracoSettings.config  
web.config   

Web.config

<umbracoConfiguration>
    <settings configSource="config\umbracoSettings.config" />
....
</umbracoConfiguration>

umbracoSettings.config

...
<distributedCall configSource="EnvironmentConfigurations\DistributedCalls.config" />
...

DistributedCalls.config

<?xml version="1.0"?>
<!-- Used by umbracoSettings.config --> 
<distributedCall enable="false">