Updated documentation of 'inverse' attribute regarding 'class' attribute of <visibility> and <validity> elements. For issue #58.

Author: end2endzone

UserManual.md

@@ -12,6 +12,7 @@ This manual includes a description of the system functionalities and capabilitie
 * [Configuration Files](#configuration-files)
   * [Menus](#menus)
   * [Visibility / Validity](#visibility--validity)
+    * [class attribute](#class-attribute)
     * [maxfiles and maxfolders attributes](#maxfiles-and-maxfolders-attributes)
     * [fileextensions attribute](#fileextensions-attribute)
     * [exists attribute](#exists-attribute)
@@ -357,13 +358,14 @@ If `inverse` attribute is not specified, then the validation is successful.
 
 The meaning of each inversed attribute in explained in the following table:
 
-| Attribute      | Meaning                                                                                                                                                                                                                   |
-|----------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| maxfiles       | Defines a minimum number of selected files. Validates a menu if **more than** _x_ files are selected.<br>If 'maxfiles` is set to 5, _more than_ 5 files must be selected for the validation to be successful.             |
-| maxfolders     | Defines a minimum number of selected folder. Validates a menu if **more than** _x_ folders are selected.<br>If 'maxfolders` is set to 3, _more than_ 3 directories must be selected for the validation to be successful.  |
-| fileextensions | Validates a menu if the given file's extension **does not** match the file extension selected by the user.<br>If multiple file extensions are specified, **no extension** must match for the validation to be successful. |
-| exists         | Validates a menu if the specified file or directory **does not** exists.<br>If multiple files/directories are specified, **all values** must _not exists_ on the system for the validation to be successful.              |
-| properties     | Validates a menu if the specified property is **empty** or **not defined**.<br>If multiple properties are specified, **all properties** must be _empty_ or _not defined_ for the validation to be successful.             |
+| Attributes     | Meaning                                                                                                                                                                                                                                      |
+|----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| class          | Validates a menu if the selected file or directory **does not** match the class of the selected files.<br>If multiple classes are specified, **no classes** must match the selected files for the validation to be successful.               |
+| maxfiles       | Defines a minimum number of selected files. Validates a menu if **more than** _x_ files are selected.<br>If 'maxfiles` is set to 5, _more than_ 5 files must be selected for the validation to be successful.                                |
+| maxfolders     | Defines a minimum number of selected folder. Validates a menu if **more than** _x_ folders are selected.<br>If 'maxfolders` is set to 3, _more than_ 3 directories must be selected for the validation to be successful.                     |
+| fileextensions | Validates a menu if the given file's extension **does not** match the file extension selected by the user.<br>If multiple file extensions are specified, **no extension** must match the selected files for the validation to be successful. |
+| exists         | Validates a menu if the selected file or directory **does not** exists.<br>If multiple files/directories are specified, **all values** must _not exists_ on the system for the validation to be successful.                                  |
+| properties     | Validates a menu if the specified property is **empty** or **not defined**.<br>If multiple properties are specified, **all properties** must be _empty_ or _not defined_ for the validation to be successful.                                |
 
 Typical use case of the `inverse` attribute is about filtering out known file extensions.