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/fo/extensions/InternalElementMapping.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: InternalElementMapping.java 1390412 2012-09-26 11:31:40Z vhennebert $ */

package org.apache.fop.fo.extensions;

import java.util.HashMap;
import java.util.Set;

import org.apache.xmlgraphics.util.QName;

import org.apache.fop.fo.ElementMapping;

/**
 * Element mapping for FOP's internal extension to XSL-FO.
 */
public class InternalElementMapping extends ElementMapping {

    /** The FOP extension namespace URI */
    public static final String URI = "http://xmlgraphics.apache.org/fop/internal";

    /** The standard XML prefix for elements and attributes in this namespace. */
    public static final String STANDARD_PREFIX = "foi";

    /** The "struct-id" attribute, to identify a structure tree element. */
    public static final String STRUCT_ID = "struct-id";

    /** The "struct-ref" attribute, to refer to a structure tree element. */
    public static final String STRUCT_REF = "struct-ref";

    public static final String SCOPE = "scope";

    private static final Set<String> PROPERTY_ATTRIBUTES = new java.util.HashSet<String>();

    static {
        //These are FOP's extension properties for accessibility
        PROPERTY_ATTRIBUTES.add(STRUCT_ID);
        PROPERTY_ATTRIBUTES.add(STRUCT_REF);
        PROPERTY_ATTRIBUTES.add(SCOPE);
    }

    /**
     * Constructor.
     */
    public InternalElementMapping() {
        namespaceURI = URI;
    }

    /**
     * Initialize the data structures.
     */
    protected void initialize() {
        if (foObjs == null) {
            foObjs = new HashMap<String, Maker>();
        }
    }

    /** {@inheritDoc} */
    public String getStandardPrefix() {
        return STANDARD_PREFIX;
    }

    /** {@inheritDoc} */
    public boolean isAttributeProperty(QName attributeName) {
        if (!URI.equals(attributeName.getNamespaceURI())) {
            throw new IllegalArgumentException("The namespace URIs don't match");
        }
        return PROPERTY_ATTRIBUTES.contains(attributeName.getLocalName());
    }

}

⏎ org/apache/fop/fo/extensions/InternalElementMapping.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)