001// Copyright 2007-2013 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
015package 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 coercions 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 */
027public interface Block
028{
029
030}