1<documentation title="Duplicate Class Names"> 2 <standard> 3 <![CDATA[ 4 Class and Interface names should be unique in a project. They should never be duplicated. 5 ]]> 6 </standard> 7 <code_comparison> 8 <code title="Valid: A unique class name."> 9 <![CDATA[ 10class <em>Foo</em> 11{ 12} 13 ]]> 14 </code> 15 <code title="Invalid: A class duplicated (including across multiple files)."> 16 <![CDATA[ 17class <em>Foo</em> 18{ 19} 20 21class <em>Foo</em> 22{ 23} 24 ]]> 25 </code> 26 </code_comparison> 27</documentation> 28