public interface Request extends Message {

    /**
     * @return number of credits this request requires
     */
    int getCreditCost ();


    /**
     * @param credits
     */
    void setRequestCredits ( int credits );


    /**
     * @return whether this is a cancel request
     */
    boolean isCancel ();


    /**
     * @return chained request
     */
    Request getNext ();

public interface Credentials {

    /**
     * 
     * @param type
     * @return instance for type, null if the type cannot be unwrapped
     */
    <T extends Credentials> T unwrap ( Class<T> type );


    /**
     * @return the domain the user account is in
     */
    String getUserDomain ();


    /**
     * @return whether these are anonymous credentials
     */
    boolean isAnonymous ();

    @Override
    protected Pattern getEncodingPattern() {
        return xmlEncodingPattern;
    }

    @Override
    protected Pattern getTagPattern() {
        return xmlTagPattern;
    }

    public Pattern getXmlEncodingPattern() {
        return xmlEncodingPattern;
    }

    public void setXmlEncodingPattern(final Pattern metaCharsetPattern) {

			if !v.header.FreeVersion() {
				return false
			}
		}
		return true
	}
	if !isXL2V1Format(e.metadata) {
		return false
	}
	if meta, _, err := isIndexedMetaV2(e.metadata); meta != nil {
		return meta.AllHidden(false)
	} else if err != nil {
		return true
	}
	// Fall back...
	xlMeta, err := e.xlmeta()
	if err != nil || len(xlMeta.versions) == 0 {
		return true
	}
	// Check versions..

    return delegate.cancel(mayInterruptIfRunning);
  }

  @Override
  public boolean isCancelled() {
    return delegate.isCancelled();
  }

  @Override
  public boolean isDone() {
    return delegate.isDone();
  }

  @Override
  @ParametricNullness
  public V get() throws InterruptedException, ExecutionException {
    return delegate.get();
  }

  @Override

    //                                                                             =======
    @Override
    public ElevateWordToLabelDbm asDBMeta() {
        return ElevateWordToLabelDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "elevate_word_to_label";
    }

    // ===================================================================================

    //                                                                             =======
    @Override
    public GroupDbm asDBMeta() {
        return GroupDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "group";
    }

    // ===================================================================================

  @Override
  public int read(char[] cbuf, int off, int len) throws IOException {
    checkNotNull(cbuf);
    if (current == null) {
      return -1;
    }
    int result = current.read(cbuf, off, len);
    if (result == -1) {
      advance();
      return read(cbuf, off, len);
    }
    return result;
  }

  @Override
  public long skip(long n) throws IOException {
    Preconditions.checkArgument(n >= 0, "n is negative");

    @Override
    public Range<K> getKey() {
      return range;
    }

    @Override
    public V getValue() {
      return value;
    }

    public boolean contains(K value) {
      return range.contains(value);
    }

    Cut<K> getLowerBound() {
      return range.lowerBound;
    }

    Cut<K> getUpperBound() {
      return range.upperBound;
    }
  }

  @Override

    /**
     * @return the errorData
     */
    public final byte[] getErrorData () {
        return this.errorData;
    }


    /**
     * @return the errorContextCount
     */
    public final byte getErrorContextCount () {
        return this.errorContextCount;
    }


    /**
     * @return the headerStart
     */
    public final int getHeaderStart () {
        return this.headerStart;