virtual public void Invoke(PdfContentStreamProcessor processor, PdfLiteral oper, List<PdfObject> operands) {
     PdfNumber charSpace = (PdfNumber)operands[0];
     processor.Gs().characterSpacing = charSpace.FloatValue;
 }

 public void Invoke(PdfContentStreamProcessor processor,
         PdfLiteral oper, List<PdfObject> operands)
         {
     processor.BeginMarkedContent((PdfName)operands[0], new PdfDictionary());
 }

        /**
         * Invokes an oper.
         * @param oper  the PDF Syntax of the oper
         * @param operands  a list with operands
         */
        private void InvokeOperator(PdfLiteral oper, List<PdfObject> operands) {
            IContentOperator op;
            operators.TryGetValue(oper.ToString(), out op);
            if (op == null)
                op = operators[DEFAULTOPERATOR];

            op.Invoke(this, oper, operands);
        }