001    // Copyright 2007, 2008 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5;
016    
017    /**
018     * A block is a collection of static text and elements, and components, derived from a component template. In the
019     * template, a block is demarcated using the <t:block> or <t:parameter> elements. The interface defines no
020     * methods, but the provided implementations of Block are capable of rendering their contents on demand.
021     * <p/>
022     * Tapestry includes coecions from String to {@link org.apache.tapestry5.Renderable} and {@link
023     * org.apache.tapestry5.Renderable} to Block. This means that components that take Block parameters may be bound to
024     * literal strings, to arbitrary numbers (or other objects, with the expectation that they will be converted to
025     * strings), or to renderable objects such as components.
026     */
027    public interface Block
028    {
029    
030    }