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