https://docs.microsoft.com/en-us/dotnet/framework/configure-apps/file-schema/index

Runtime Settings Schema

Describes the elements that configure assembly binding and runtime behavior.

Web Settings Schema

All elements in the Web settings schema, which includes elements for configuring how ASP.NET works with a host application such as IIS. Used in Aspnet.config files.

<system.web> Element (Web Settings)

ASP.NET Settings Schema

Describes the elements that control the behavior of ASP.NET Web applications.

system.web Element (ASP.NET Settings Schema)

compilation Element (ASP.NET Settings Schema)

child element

assemblies

Defines a collection of names of assemblies that are used during compilation of an ASP.NET resource.

 Remarks

In the .NET Framework version 2.0, the compilers child element of the compilation element is deprecated in favor of the compilers element of the system.codeDom section.

However, using the compilers child element of the compilation element is still valid and overrides the compilers element that is located in the system.codedom section.

Configuration file schema for the .NET Framework

原文：http://www.cnblogs.com/chucklu/p/7569187.html