src/ooxml/java/org/apache/poi/xssf/binary/XSSFBRelation.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.xssf.binary;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.poi.ooxml.POIXMLRelation;
import org.apache.poi.openxml4j.opc.PackageRelationshipTypes;
import org.apache.poi.util.Internal;
import org.apache.poi.xssf.usermodel.XSSFRelation;

/**
 * Need to have this mirror class of {@link XSSFRelation}
 * because of conflicts with regular ooxml relations.
 * If we failed to break this into a separate class, in the cases of SharedStrings and Styles,
 * 2 parts would exist, and "Packages shall not contain equivalent part names..."
 * <p>
 * Also, we need to avoid the possibility of breaking the marshalling process for xml.
 */
@Internal
public class XSSFBRelation extends POIXMLRelation {
    private static final Logger LOGGER = LogManager.getLogger(XSSFBRelation.class);

    static final XSSFBRelation SHARED_STRINGS_BINARY = new XSSFBRelation(
            "application/vnd.ms-excel.sharedStrings",
            "http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings",
            "/xl/sharedStrings.bin"
    );

    public static final XSSFBRelation STYLES_BINARY = new XSSFBRelation(
            "application/vnd.ms-excel.styles",
            PackageRelationshipTypes.STYLE_PART,
            "/xl/styles.bin"
    );

    private XSSFBRelation(String type, String rel, String defaultName) {
        super(type, rel, defaultName);
    }

}