diff --git a/JsonPreprocessor/JsonPreprocessor.pdf b/JsonPreprocessor/JsonPreprocessor.pdf
index 761c1d7..e51a66b 100644
Binary files a/JsonPreprocessor/JsonPreprocessor.pdf and b/JsonPreprocessor/JsonPreprocessor.pdf differ
diff --git a/packagedoc/additional_docs/Description.tex b/packagedoc/additional_docs/Description.tex
index e60d2fe..6f1fa9f 100644
--- a/packagedoc/additional_docs/Description.tex
+++ b/packagedoc/additional_docs/Description.tex
@@ -51,9 +51,13 @@ \section{How to execute}
 
 \section{User defined naming convention}
 
-By default, key names in JSON files can contain any characters (but cannot be empty). But it might be required to limit the character set.
-For this purpose the \pkg\ supports an optional user-defined convention for key names. This is enforced using a \pcode{regex} pattern
-passed to the constructor of the \pkg\ class.
+By default, key names in JSON files can contain any characters (but cannot be empty). The JSONP format extends the JSON format with some features using
+square, curly and angle brackets as syntax elements: \pcode{[}, \pcode{]}, \pcode{\{}, \pcode{\}}, \pcode{<}, \pcode{>}, that will be described below in this document.
+
+\textbf{These brackets must not be used within key names!}
+
+It might be required to add further limitations to the set of allowed characters. For this purpose the \pkg\ supports an optional user-defined convention for key names.
+This is enforced using a \pcode{regex} pattern passed to the constructor of the \pkg\ class.
 
 Assuming key names may only contain letters, digits and underscores, but must start with a letter, then the \pkg\ has to be initialized
 in this way:
diff --git a/packagedoc/additional_docs/The JSONP format.tex b/packagedoc/additional_docs/The JSONP format.tex
index a7f838d..835ac76 100644
--- a/packagedoc/additional_docs/The JSONP format.tex	
+++ b/packagedoc/additional_docs/The JSONP format.tex	
@@ -16,12 +16,20 @@
 
 \label{thejsonpformat}
 
-This chapter explains the format of JSON files used by the \pkg\ in detail. We concentrate here on the content of the JSON files
-and the corresponding results, available in Python dictionary format.
+The JSONP format is computed by the Python application \textbf{JsonPreprocessor}. Additionally to this, it is also possible to use the JSONP format
+within tests of a test automation framework called \textbf{RobotFramework AIO} (\href{https://robotframework-aio.org/}{homepage}).
+
+The component that within the \textbf{RobotFramework AIO} is responsible for the execution of the \textbf{JsonPreprocessor}, is called
+\textbf{TestsuitesManagement}. Because the \textbf{JsonPreprocessor} is a pure Python application, whereas the \textbf{RobotFramework AIO}
+is a framework with own syntax rules and conditions, in some cases the JSONP format deviates in both worlds. Where required you will find corresponding
+hints in this chapter. In all other cases the JSONP format is the same in \textbf{JsonPreprocessor} and \textbf{RobotFramework AIO}.
+
+This chapter explains the format of JSONP files in detail. We concentrate here on the content of the JSONP files and the corresponding results,
+available in Python dictionary format. 
 
 \section{Standard JSON format}
 
-The \pkg\ supports JSON files with standard extension \plog{.json} and standard content.
+The \textbf{JsonPreprocessor} supports JSON files with standard extension \plog{.json} and standard content.
 
 \textbullet\ JSON file:
 
@@ -54,6 +62,8 @@ \section{Standard JSON format}
 }
 \end{pythoncode}
 
+\newpage
+
 This content produces the following output:
 
 \begin{pythonlog}
@@ -77,8 +87,8 @@ \section{Boolean and null values}
 
 In Python, the corresponding values differ: \pcode{True}, \pcode{False} and \pcode{None}.
 
-Because the \pkg\ is a Python application and therefore the returned content is required to be formatted Python compatible,
-the \pkg\ does a conversion automatically.
+Because the \textbf{JsonPreprocessor} is a Python application and therefore the returned content is required to be formatted Python compatible,
+the \textbf{JsonPreprocessor} does a conversion automatically.
 
 Accepted in JSON files are both styles:
 
@@ -126,7 +136,7 @@ \section{Comments}
 }
 \end{pythoncode}
 
-All lines starting with \pcode{//}, are ignored by the \pkg. The output of this example is the same than in the previous example.
+All lines starting with \pcode{//} are ignored by the \textbf{JsonPreprocessor}. The output of this example is the same as in the previous example.
 
 \vspace{2ex}
 
@@ -181,7 +191,7 @@ \section{Import of JSON files}
    \item A file \plog{componentB.jsonp} containing remaining parameters (with specific values) required for component \textit{B}
 \end{enumerate}
 
-Finally we use the import mechanism of the \pkg\ to import the file \plog{common.jsonp} in file \plog{componentA.jsonp} and also in
+Finally we use the import mechanism of the \textbf{JsonPreprocessor} to import the file \plog{common.jsonp} in file \plog{componentA.jsonp} and also in
 file \plog{componentB.jsonp}.
 
 \vspace{2ex}
@@ -622,7 +632,7 @@ \section{Overwriting parameters}\label{overwriting-parameters}
 
 \begin{itemize}
    \item Existing parameters are accessed by a dollar operator and a pair of curly brackets (\pcode{$\{...\}}) with the parameter name inside.
-   \item If the entire expression of the right hand side of the colon is such a dollar operator expression, it is not required
+   \item If the entire expression of the right-hand side of the colon is such a dollar operator expression, it is not required
          to encapsulate this expression in quotes (in opposite to what pure JSON would require).
    \item Without quotes, the dollar operator keeps the data type of the referenced parameter. If you use quotes, the value of the used parameter
          will be converted to type \pcode{str}. This implicit string conversion is limited to parameters of simple data types like integers and floats.
@@ -644,7 +654,7 @@ \section{Overwriting parameters}\label{overwriting-parameters}
 "int_val_b"            : ${int_val},
 \end{pythoncode}
 
-It is not required to encapsulate dollar operator expressions at the right hand side of the colon in quotes.
+It is not required to encapsulate dollar operator expressions at the right-hand side of the colon in quotes.
 But nevertheless, it is possible to use quotes. In case of:
 
 \begin{pythoncode}
@@ -766,8 +776,8 @@ \section{Overwriting parameters}\label{overwriting-parameters}
 }
 \end{pythoncode}
 
-The dollar operator syntax at the left hand side of the colon is the same than previously used on the right hand side.
-The entire expression at the left hand side of the colon must \textit{not} be encapsulated in quotes in this case.
+The dollar operator syntax at the left-hand side of the colon is the same as previously used on the right-hand side.
+The entire expression at the left-hand side of the colon must \textit{not} be encapsulated in quotes in this case.
 
 \textbf{Outcome:}
 
@@ -871,13 +881,13 @@ \section{Overwriting parameters}\label{overwriting-parameters}
          Without the quotes (\pcode{[$\{param\}]}), the content inside the square brackets is an integer.
 \end{itemize}
 
-In the context of \pkg\ JSON files, only strings and integers are expected to be inside square brackets (except the brackets are used to define a list).
+In the context of \textbf{JsonPreprocessor} JSON files, only strings and integers are expected to be inside square brackets (except the brackets are used to define a list).
 Other data types are not supported here.
 
 Whether a string or an integer is expected, depends on the data type of the parameter, the square bracket expression belongs to. Dictionaries require a string (a key name), lists require an integer (an index).
 Deviations will cause an error.
 
-Summarized the following combinations are valid (on both the left hand side of the colon and the right hand side of the colon):
+Summarized the following combinations are valid (on both the left-hand side of the colon and the right-hand side of the colon):
 
 \begin{pythoncode}
 ${listparam}[${intparam}]
@@ -896,7 +906,7 @@ \section{Overwriting parameters}\label{overwriting-parameters}
 
 \begin{itemize}
    \item We have several JSON files, each for a certain purpose within a project (e.g. for every feature of this project a separate JSON file).
-   \item They belong together and therefore they are all imported into a main JSON file that is the file that is handed over to the \pkg.
+   \item They belong together and therefore they are all imported into a main JSON file that is the file that is handed over to the \textbf{JsonPreprocessor}.
    \item Every imported JSON file introduces a certain bunch of parameters. All parameters need to be a part of a common dictionary.
    \item Outcome is that finally only one single dictionary is used to access the parameters from all JSON files imported in the main JSON file.
 \end{itemize}
@@ -971,7 +981,7 @@ \section{Overwriting parameters}\label{overwriting-parameters}
    ${project_values}['featureC_params'] : {},
 \end{pythoncode}
 
-These initializations are done implicitly by the \pkg. Further details about the implicit creation of dictionaries can be found in section
+These initializations are done implicitly by the \textbf{JsonPreprocessor}. Further details about the implicit creation of dictionaries can be found in section
 \hyperref[implicit-creation]{Implicit creation of dictionaries}.
 
 It is for sure still possible to do the initialization of a dictionary explicitly with \pcode{\{\}}. But keep in mind: This deletes all already existing keys in this dictionary!
@@ -1003,7 +1013,7 @@ \section{\texttt{dotdict} notation}\label{dotdict-notation}
 ${dictionary}['key']['sub_key']
 \end{pythoncode}
 
-Additionally to this standard notation, the \pkg\ supports the so called \textit{dotdict} notation where keys
+Additionally to this standard notation, the \textbf{JsonPreprocessor} supports the so called \textit{dotdict} notation where keys
 are handled as attributes:
 
 \begin{pythoncode}
@@ -1131,7 +1141,7 @@ \section{Dynamic key names}
 The value of \pcode{newparam1} is defined by an expression that is encapsulated in quotes and contains - beneath hard coded parts - a dollar operator expression
 (that is the dynamic part).
 
-The same is also possible on the left hand side of the colon. In this case the name of a parameter is created dynamically.
+The same is also possible on the left-hand side of the colon. In this case the name of a parameter is created dynamically.
 
 \vspace{2ex}
 
@@ -1223,10 +1233,10 @@ \section{Implicit creation of dictionaries}\label{implicit-creation}
 
 The result will be the same as in the previous example.
 
-It can be seen now that this way of creating nested dictionaries is rather long winded, because every inititialization of a dictionary
+It can be seen now that this way of creating nested dictionaries is rather long-winded, because every initialization of a dictionary
 requires a separate line of code (at every level).
 
-To shorten the code, the \pkg\ supports an implicite creation of dictionaries.
+To shorten the code, the \textbf{JsonPreprocessor} supports an implicit creation of dictionaries.
 
 This is the resulting code in standard notation:
 
@@ -1270,7 +1280,7 @@ \section{Implicit creation of dictionaries}\label{implicit-creation}
 you will \textit{not} get an error message! The entire data structure will be created implicitly. The impact is that this method
 is very susceptible to typing mistakes.
 
-The implicite creation of data structures does not work with lists! In case you use a list index out of range, you will get
+The implicit creation of data structures does not work with lists! In case you use a list index out of range, you will get
 a corresponding error message.
 
 % --------------------------------------------------------------------------------------------------------------
@@ -1418,7 +1428,7 @@ \section{Python inline code}
 "param" : "The value is <\textless{}\textless{}><(\emph{Python expression})><\textgreater{}\textgreater{}>"
 \end{pythoncode}
 
-The usage of Python inline code is limited to the right hand side of the colon (\emph{key values}).
+The usage of Python inline code is limited to the right-hand side of the colon (\emph{key values}).
 This feature cannot be used to create key names.
 
 Python inline code cannot be used immediately to select list elements or dictionary keys that shall be overwritten. The following code is invalid:
@@ -1471,6 +1481,76 @@ \section{Python inline code}
     % "element" : <<eval import itertools; combined_list=list(itertools.combinations([1, 2, 3], 2)); element=combined_list[0]>>
     % C:\workplace\ROBFW\components\python-jsonpreprocessor\test\testfiles\jpp-test_config_2108.jsonp
 
+% --------------------------------------------------------------------------------------------------------------
+
+\newpage
+
+\section{Special characters within key names}
+
+Basically, the \textbf{JsonPreprocessor} considers the JSON naming convention for key names. Within JSONP files allowed is what JSON allows,
+but with the following limitation: The JSONP format extends the JSON format with some features using square, curly and angle brackets as syntax elements:
+\pcode{[}, \pcode{]}, \pcode{\{}, \pcode{\}}, \pcode{<}, \pcode{>}.
+
+\textbf{These brackets must not be used within key names!}
+
+This JSONP code:
+
+\begin{pythoncode}
+{
+    "[" : 1,
+    "B" : ${[}
+}
+\end{pythoncode}
+
+causes:
+
+\begin{pythonlog}
+Error: 'Invalid expression found: '${[}' - The brackets mismatch!!!'!
+\end{pythonlog}
+
+All other special characters can be used immediately:
+
+\begin{pythoncode}
+{
+    "$" : 1,
+    "B" : ${$}
+}
+\end{pythoncode}
+
+Result:
+
+\begin{pythonlog}
+DotDict({'$': 1, 'B': 1})
+\end{pythonlog}
+
+Strings are handled as raw strings. Therefore, masking has no effect:
+
+\begin{pythoncode}
+{
+    "\\$" : 1,
+    "B" : ${\\$}
+}
+\end{pythoncode}
+
+The backslashes are part of the key name:
+
+\begin{pythonlog}
+DotDict({'\\$': 1, 'B': 1})
+\end{pythonlog}
+
+\textit{The masking requires two backslashes! A single backslash will cause a JSON syntax error!}
+
+\vspace{2ex}
+
+\begin{boxhint}{Format deviation}
+In opposite to the \textbf{JsonPreprocessor}, the \textbf{TestsuitesManagement} of the \textbf{RobotFramework AIO} is more restrictive
+and does not allow any special characters. Key names are limited to letters and digits!
+\end{boxhint}
+
+
+
+
+
 
 % --------------------------------------------------------------------------------------------------------------