t4 snippet for adding xml doc from .edmx

xml-doc.tt

// heavily modified version of http://forums.asp.net/t/2011994.aspx

...
WriteLine("");
WriteDocumentation(entity.Documentation);#>
...
    WriteDocumentation(edmProperty.Documentation, CurrentIndent);
...
    WriteDocumentation(complexProperty.Documentation);
...
    WriteDocumentation(navigationProperty.Documentation);
...

public void WriteDocumentation(Documentation documentation, string indent = "")
{
    if(documentation != null && !string.IsNullOrEmpty(documentation.Summary))
    {
        WriteLine(indent + "/// <summary>");
        WriteLine(indent + "/// " + documentation.Summary);
        WriteLine(indent + "/// </summary>");

        if(!string.IsNullOrEmpty(documentation.LongDescription))
        {
            WriteLine(indent + "/// <remarks>");
            WriteLine(indent + "/// " + documentation.LongDescription);
            WriteLine(indent + "/// </remarks>");
        }
    }
}