DevelopmentModuleAPI.md

+### goodReadingName
+
+```perl
+$valid = goodReadingName($name);
+```
+This function checks if *Readingname* `$name` is a valid format which consists of
+
+* upper and lowercase letters [a-zA-Z]
+* digits [0-9]
+* underscore `_`
+* minus `-`
+* dot `.`
+* slash `/`
+
+If the identifier starts with a dot `.`, it's considered to be an internal identifier and is treated differently in visualization, i.e. hidden.
+
+For valid identifiers a true value is returned, false otherwise. This function can be used in if-constructs directly to test whether a *Readingname* is valid or not.