Variable names and type names

The rules for variable names are as follows:

• A variable name can contain only alphanumeric characters (a-z, A-Z, 0-9), underscore (_), or hyphen (-).
• Case is significant (for example, strTmp and strtmp are two different names).
• A variable name cannot be the same as the short name or the fully qualified class name of an imported type.

The rules for type names are as follows:

• A type name can contain only the alphanumeric characters, underscore (_), hyphen (-), or period (.).
• Type names are case sensitive.