Global Ids

   /**
     *  Creates a new GlobalURNId using the "urn" namespace.
     *
     *  @param authority the authority for this Id
     *  @param identifier the identifier for this Id
     *  @throws org.osid.NullArgumentException null argument provided
     */

    public GlobalURLId(String authority, String identifier);

    /**
     *  Returns an Id from a string representation of a URN.
     *
     *  @param urn the string to be parsed
     *  @return an Id with the string components
     *  @throws org.osid.InvalidArgumentException string could not be parsed
     *  @throws org.osid.NullArgumentException urn is null
     */

    public static org.osid.id.Id valueOf(String urn)

   /**
     *  Creates a new GlobalURLId using the "url" namespace.
     *
     *  @param authority the authority for this Id
     *  @param identifier the identifier for this Id
     *  @throws org.osid.NullArgumentException null argument provided
     */

    public GlobalURLId(String authority, String identifier);

    /**
     *  Returns an Id from a string representation of a URL.
     *
     *  @param url the string to be parsed
     *  @return an Id
     *  @throws org.osid.InvalidArgumentException string could not be parsed
     *  @throws org.osid.NullArgumentException str is null
     */

    public static org.osid.id.Id valueOf(String url)

    /**
     *  Returns an Id from a Java URL.
     *
     *  @param url the url
     *  @throws org.osid.InvalidArgumentException url could not be parsed
     *  @throws org.osid.NullArgumentException str is null
     */

    public static org.osid.id.Id valueOf(java.net.URL url)

   /**
     *  Creates a new PathId using the "path" namespace and "localhost" authority.
     *
     *  @param path the path
     *  @throws org.osid.NullArgumentException null argument provided
     */

    public PathId(String path);

    /**
     *  Returns an Id from path name. The path name is converted to its canonical absolute form 
     *  by removing redundant components such as . and ..
     *
     *  @param path the path
     *  @return an Id 
     *  @throws org.osid.InvalidArgumentException could not get path
     *  @throws org.osid.NullArgumentException path is null
     */

    public static org.osid.id.Id valueOf(String path)

    /**
     *  Returns an Id from a Java File. The path name is converted to its canonical absolute form 
     *  by removing redundant components such as . and ..
     *
     *  @param file the file
     *  @throws org.osid.InvalidArgumentException could not get path
     *  @throws org.osid.NullArgumentException file is null
     */

    public static org.osid.id.Id valueOf(java.io.File file)