Parameters
Expression<Func<T, object>> expression
        A member access lambda expression for the property
String[] columnNames
        A list of column names used for this key
Type CompositeIndexBuilder<T>
Namespace FluentNHibernate.Mapping.Builders
Expression<Func<T, object>> expressionA member access lambda expression for the property
String[] columnNamesA list of column names used for this key
Expression<Func<T, object>> expressionA member access lambda expression for the property