code: public boolean isWhitespace(int start, int length)
    {
  
      int sourcechunk = start >>> m_chunkBits;
      int sourcecolumn = start & m_chunkMask;
      int available = m_chunkSize - sourcecolumn;
      boolean chunkOK;
  
      while (length > 0)
      {
        int runlength = (length <= available) ? length : available;
  
        if (sourcechunk == 0 && m_innerFSB != null)
          chunkOK = m_innerFSB.isWhitespace(sourcecolumn, runlength);
        else
          chunkOK = org.apache.xml.utils.XMLCharacterRecognizer.isWhiteSpace(
            m_array[sourcechunk], sourcecolumn, runlength);
  
        if (!chunkOK)
          return false;
  
        length -= runlength;
  
        ++sourcechunk;
  
        sourcecolumn = 0;
        available = m_chunkSize;
      }
  
      return true;
    }
docs: @return true if the specified range of characters are all whitespace,
  as defined by XMLCharacterRecognizer.
  <p>
  CURRENTLY DOES NOT CHECK FOR OUT-OF-RANGE.
  
  @param start Offset of first character in the range.
  @param length Number of characters to send.