What Is fop.jar? I got it from the fop-2.7-bin.zip.

fop.jar in fop-2.7-bin.zip is the JAR file for FOP 2.7, which is a print formatter driven by XSL formatting objects (XSL-FO). You can obtain fop.jar from the build folder of the fop-2.7-bin.zip file.

Below is the information about the fop.jar (2.2) file:

JAR File Size and Download Location:

JAR name: fop.jar, fop-2.7.jar
Target JDK version: 1.7
File name: fop.jar
File size: 4442817 bytes
Release date: 20-Jan-2022
Download: Apache FOP Website

Java source code files for fop.jar:

⏎ org/apache/fop/accessibility/StructureTreeEventHandler.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/* $Id$ */

package org.apache.fop.accessibility;

import java.util.Locale;

import org.xml.sax.Attributes;

/**
 * Receive notifications relating to the structure tree of an FO document.
 * A structure tree is a reduced version of the document's FO tree, containing only the logical
 * structure that is used by accessible output formats.
 */
public interface StructureTreeEventHandler {

    /**
     * Starts a page sequence structure tree node.
     *
     * @param locale The locale of the page sequence
     * @param role the value of the role property. May be null.
     */
    void startPageSequence(Locale locale, String role);

    /**
     * Starts a structure tree node.
     *
     * @param name the name of the structure tree node
     * @param attributes the node properties
     * @param parent the parent of the node. May be null, in which case the parent node is
     * the node corresponding to the previous call to this method
     * @return the corresponding structure tree element
     */
    StructureTreeElement startNode(String name, Attributes attributes, StructureTreeElement parent);

    /**
     * Ends a structure tree node.
     *
     * @param name the name of the structure tree node
     */
    void endNode(String name);

    /**
     * Starts an image node.
     *
     * @param name the name of the structure tree node
     * @param attributes the node properties
     * @param parent the parent of the node. May be null, in which case the parent node is
     * the node corresponding to the previous call to this method
     * @return the corresponding structure tree element
     */
    StructureTreeElement startImageNode(String name, Attributes attributes, StructureTreeElement parent);

    /**
     * Starts a node that can be referenced by other nodes. This is usually a
     * node that can have Marked Content References as children.
     *
     * @param name the name of the structure tree node
     * @param attributes the node properties
     * @param parent the parent of the node. May be null, in which case the parent node is
     * the node corresponding to the previous call to this method
     * @return the corresponding structure tree element
     */
    StructureTreeElement startReferencedNode(String name, Attributes attributes, StructureTreeElement parent);

    /**
     * Ends a page sequence structure tree node.
     */
    void endPageSequence();
}

⏎ org/apache/fop/accessibility/StructureTreeEventHandler.java

Or download all of them as a single archive file:

File name: fop-2.7-src.zip
File size: 3401312 bytes
Release date: 2022-01-20
Download 

⇒ "fop" Command in fop-2.7-bin.zip

⇐ What Is fop-2.7-bin.zip

⇑ Download and Installing of FOP 2.x

⇑⇑ FAQ for FOP (Formatting Object Processor)