Suggest:

/**
 * Find progressively less specific MIME type
variants.
 * Given a MIME type such as
"text/ant+xml;charset=UTF-8" it might
 * produce:
 * <ul>
 * <li><code>text/ant+xml;charset=UTF-8</code></li>
 * <li><code>text/ant+xml</code></li>
 * <li><code>text/xml</code></li>
 * <li><code>text/*</code></li>
 * <li><code>content/unknown</code></li>
 * </ul>
 * May be useful e.g. for finding suitable editor
kits for a file.
 * @param a fully-specified MIME type
 * @return a read-only iterator of MIME type
strings based on that,
 *         from most to least specific
 */
public static Iterator
Utilities.mimeTypeDefaults(String mt);

/**
 * Find progressively less specific MIME type variants
 * as folder-like names suitable for JNDI lookup.
 * Given a MIME type such as
"text/ant+xml;charset=UTF-8" it might
 * produce:
 * <ul>
 * <li><code>text/xml/ant/</code></li>
 * <li><code>text/xml/</code></li>
 * <li><code>text/</code></li>
 * <li>(the empty string)</li>
 * </ul>
 * May be useful e.g. for finding some settings
for a file
 * based on its MIME type, with the possibility to
use defaults.
 * @param a fully-specified MIME type
 * @return a read-only iterator of contexts based
on that,
 *         from most to least specific
 */
public static Iterator
Utilities.mimeTypeContexts(String mt);