log4net/Layout/XMLLayout.cs

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#region Copyright & License
//
// Copyright 2001-2005 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#endregion

using System;
using System.Text;
using System.Xml;

using log4net.Core;
using log4net.Util;

namespace log4net.Layout
{
	/// <summary>
	/// Layout that formats the log events as XML elements.
	/// </summary>
	/// <remarks>
	/// <para>
	/// The output of the <see cref="XmlLayout" /> consists of a series of 
	/// log4net:event elements. It does not output a complete well-formed XML 
	/// file. The output is designed to be included as an <em>external entity</em>
	/// in a separate file to form a correct XML file.
	/// </para>
	/// <para>
	/// For example, if <c>abc</c> is the name of the file where
	/// the <see cref="XmlLayout" /> output goes, then a well-formed XML file would 
	/// be:
	/// </para>
	/// <code lang="XML">
	/// &lt;?xml version="1.0" ?&gt;
	/// 
	/// &lt;!DOCTYPE log4net:events SYSTEM "log4net-events.dtd" [&lt;!ENTITY data SYSTEM "abc"&gt;]&gt;
	///
	/// &lt;log4net:events version="1.2" xmlns:log4net="http://logging.apache.org/log4net/schemas/log4net-events-1.2&gt;
	///     &amp;data;
	/// &lt;/log4net:events&gt;
	/// </code>
	/// <para>
	/// This approach enforces the independence of the <see cref="XmlLayout" /> 
	/// and the appender where it is embedded.
	/// </para>
	/// <para>
	/// The <c>version</c> attribute helps components to correctly
	/// interpret output generated by <see cref="XmlLayout" />. The value of 
	/// this attribute should be "1.2" for release 1.2 and later.
	/// </para>