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An OSGi bundle for Saxon-HE
There is a newer version: 10.5
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2013 Saxonica Limited.
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.serialize;

import net.sf.saxon.lib.NamespaceConstant;
import net.sf.saxon.lib.SaxonOutputKeys;
import net.sf.saxon.om.NodeName;
import net.sf.saxon.trans.XPathException;

import javax.xml.transform.OutputKeys;

/**
 * This class generates HTML 5.0 output
 */
public class HTML50Emitter extends HTMLEmitter {


    static {
        setEmptyTag("area");
        setEmptyTag("base");
        setEmptyTag("base");
        setEmptyTag("basefont");
        setEmptyTag("br");
        setEmptyTag("col");
        setEmptyTag("command");
        setEmptyTag("embed");
        setEmptyTag("frame");
        setEmptyTag("hr");
        setEmptyTag("img");
        setEmptyTag("input");
        setEmptyTag("isindex");
        setEmptyTag("keygen");
        setEmptyTag("link");
        setEmptyTag("meta");
        setEmptyTag("param");
        setEmptyTag("source");
        setEmptyTag("track");
        setEmptyTag("wbr");
    }

    /**
     * Constructor
     */

    public HTML50Emitter() {
        version = 5;
    }

    /**
     * Decide whether an element is "serialized as an HTML element" in the language of the 3.0 specification
     *
     * @return true if the element is to be serialized as an HTML element
     */
    @Override
    protected boolean isHTMLElement(NodeName name) {
        String uri = name.getURI();
        return uri.equals("") || uri.equals(NamespaceConstant.XHTML);
    }

    protected void openDocument() throws XPathException {
        String versionProperty = outputProperties.getProperty(SaxonOutputKeys.HTML_VERSION);
        // Note, we recognize html-version even when running XSLT 2.0.
        if (versionProperty == null) {
            versionProperty = outputProperties.getProperty(OutputKeys.VERSION);
        }

        if (versionProperty != null) {
            if (versionProperty.equals("5.0")) {
                version = 5;
            } else {
                XPathException err = new XPathException("Unsupported HTML version: " + versionProperty);
                err.setErrorCode("SESU0013");
                throw err;
            }
        }
        String systemId = outputProperties.getProperty(OutputKeys.DOCTYPE_SYSTEM);
        String publicId = outputProperties.getProperty(OutputKeys.DOCTYPE_PUBLIC);

        // Treat "" as equivalent to absent. This goes beyond what the spec strictly allows.
        if ("".equals(systemId)) {
            systemId = null;
        }
        if ("".equals(publicId)) {
            publicId = null;
        }
        super.openDocument();
        writeDocType(null, "html", systemId, publicId);
    }

    /**
     * Output the document type declaration
     *
     * @param displayName The element name
     * @param systemId    The DOCTYP system identifier
     * @param publicId    The DOCTYPE public identifier
     */

    protected void writeDocType(NodeName name, String displayName, String systemId, String publicId) throws XPathException {
        try {
            if (systemId == null && publicId == null) {
                writer.write("\n");
            } else {
                super.writeDocType(name, displayName, systemId, publicId);
            }
        } catch (java.io.IOException err) {
            throw new XPathException(err);
        }

    }

    protected boolean writeDocTypeWithNullSystemId() {
        return true;
    }
}