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phloc CSS parser an other components

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/**
 * Copyright (C) 2006-2014 phloc systems
 * http://www.phloc.com
 * office[at]phloc[dot]com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.phloc.css.decl;

import com.phloc.commons.annotations.MustImplementEqualsAndHashcode;
import com.phloc.css.ICSSWriteable;

/**
 * 
 * Marker interface for all top level CSS elements that can occur in any order
 * 
 * 
 * style rules - {@link CSSStyleRule}
 * page rules - {@link CSSPageRule}
 * media rules - {@link CSSMediaRule}
 * font face rules - {@link CSSFontFaceRule}
 * keyframes rules - {@link CSSKeyframesRule}
 * viewport rules - {@link CSSViewportRule}
 * supports rules - {@link CSSSupportsRule}
 * unknown rules - {@link CSSUnknownRule}
 * 
 * 
 * To easily iterate over all rules contained in a {@link CascadingStyleSheet}
 * you can use the
 * {@link com.phloc.css.decl.visit.CSSVisitor#visitCSS(CascadingStyleSheet, com.phloc.css.decl.visit.ICSSVisitor)}
 * method. An empty stub implementation of
 * {@link com.phloc.css.decl.visit.ICSSVisitor} is the class
 * {@link com.phloc.css.decl.visit.DefaultCSSVisitor} which is a good basis for
 * your own implementations.
 * 
 * 
 * @author Philip Helger
 */
@MustImplementEqualsAndHashcode
public interface ICSSTopLevelRule extends ICSSWriteable
{
  /* empty */
}