/**
 * Helper class for managing related query configurations.
 * This class provides functionality to load, cache, and retrieve related queries
 * based on search terms and virtual hosts. Related queries are used to suggest
 * alternative or supplementary search terms to improve search results.
 */
public class RelatedQueryHelper extends AbstractConfigHelper {
    private static final Logger logger = LogManager.getLogger(RelatedQueryHelper.class);

    /**

*[Fess Site Search](https://github.com/codelibs/fess-site-search)* is a free alternative to [Google Site Search](https://enterprise.google.com/search/products/gss.html). For more details, see the [FSS JS Generator documentation](https://fss-generator.codelibs.org/docs/manual).

## Website

     * @return the embedded file, or null if not found
     */
    protected PDEmbeddedFile getEmbeddedFile(final PDComplexFileSpecification fileSpec) {
        // search for the first available alternative of the embedded file
        PDEmbeddedFile embeddedFile = null;
        if (fileSpec != null) {
            embeddedFile = fileSpec.getEmbeddedFileUnicode();
            if (embeddedFile == null) {

				"model/vnd.moml+xml",
				"model/vnd.mts",
				"model/vnd.parasolid.transmit.binary",
				"model/vnd.parasolid.transmit.text",
				"model/vnd.vtu",
				"model/vrml",
				"multipart/alternative",
				"multipart/appledouble",
				"multipart/byteranges",
				"multipart/digest",
				"multipart/encrypted",
				"multipart/example",
				"multipart/form-data",
				"multipart/header-set",