src/main/java/org/jboss/util/xml/catalog/Resolver.java
public String resolveSystemReverse(String systemId)
	throws MalformedURLException, IOException {
	Vector resolved = resolveAllSystemReverse(systemId);
	if (resolved != null && resolved.size() > 0) {
	    return (String) resolved.elementAt(0);
	} else {
	    return null;
	}
    }
public String resolveSystemReverse(String systemId)
	throws MalformedURLException, IOException {
	Vector resolved = resolveAllSystemReverse(systemId);
	if (resolved != null && resolved.size() > 0) {
	    return (String) resolved.elementAt(0);
	} else {
	    return null;
	}
    }
Find the URN for a given system identifier.

@param systemId The system ID to locate.

@throws MalformedURLException
@throws IOException
@return A (single) URN that maps to the systemId.