code: public byte[] getContent() throws TLVParserException {
          byte[] content = this.content;
          if (!children.isEmpty()) {
              for (TLVElement child : children) {
                  content = Util.join(content, child.encodeHeader());
                  content = Util.join(content, child.getContent());
              }
          }
          return content;
      }
docs: Returns the TLV content. If TLV does not include content then empty array is returned.
  
  @return Byte array including TLV element content.
  
  @throws TLVParserException