=== Warnings ===

Warnings are associated with problems that occur during the documentation generation process or violations of certain norms as specified in the Documentation Specification part of the TTCN-3 standard (ES 201 873-10). These warnings resemble the warnings in T3C quality checks and due to this fact, these features may be moved to T3C in the future. It possible to turn each check or group of checks (a large portion of the checks falls under the ''consistent tag usage'' category) on and off as described in the configuration section.

==== Empty Tags ====

In case a tagged paragraph is specified, but the tag body is empty, a corresponding warning will be issued with the location of the occurrence.

'''Example'''
{{{
/*
 * @remark
*/
}}}

will result in:

{{{
testFile.ttcn: 17: WARNING: Empty tag found: @remark
}}}

Note that the warnings currently refer to the line number of the module definition and not of the documentation tag itself. This concerns all warning messages.

==== Misplaced Tags ====

The use of certain tags in tagged paragraphs is restricted to certain contexts. If a documentation tag is used in association with a module definition that does not permit the use of such a tag a warning will be issued.

'''Example'''  
{{{
/*
 * @config text
*/
function f1(){
     ...
}
}}}

would produce 

{{{
testFile.ttcn: 31: WARNING: @config tag found (may not be used here)
}}}

==== Identical Description Tags ====
If identical description tags (@desc) are used to describe two or more different element definitions within all the processed modules, a warning will be thrown. The identity checking mechanism so far is rather simple, based on a direct string comparison. An alternative approach may be implemented in the future, using a different notion of identity, shall this become necessary.

'''Example'''
{{{
/*
 * @desc Descrption1
*/
function f1(){
     ...
}
/*
 * @desc Descrption1
*/
function f2(){
     ...
}
}}}

results in 

{{{
testFile.ttcn: 31: WARNING: Identical @desc tag found: "Descrption1" (testFile.ttcn:37)
}}}

==== Too Many Tags ====

While certain tags may occur multiple times (e.g. @author tags), other can only occur once. If a tag that can occur only once per definition as specified in the standard, occurs multiple times a warning will be thrown.

'''Example'''
{{{
/*
 * @version 0.01
 * @version 0.02
*/
function f1(){
     ...
}
}}}

will result in

{{{
testFile.ttcn: 31: WARNING: Multiple @version tags found (may only contain one)
}}}

==== Undocumented Parameters ====

Formal parameters shall be described by means of the corresponding @param tags. If this is not the case and if '''checkUndocumentedParameters''' is enabled in the configuration profile, a warning will be thrown.

'''Example'''
{{{
/*
 * @param a Description of Parameter a
*/
function f1(integer a, boolean b){
     ...
}
}}}

will result in

{{{
testFile.ttcn: 31: WARNING: Undocumented parameter found: b
}}}

'''Note:''' There are more subtle details related to the (proper) documentation of formal parameters. In future considerations, these subtleties may be implemented more thoroughly.  

==== Required @desc Tags for Functions ====

If enabled ('''checkFunctionDescTagsRequired''' configuration flag, disabled by default), this check will throw warnings if there are no @desc tags present for a function definition.

'''Example'''
{{{
/*
 * @param a Description of Parameter a
*/
function f1(integer a){
     ...
}
}}}

will result in

{{{
testFile.ttcn: 31: WARNING: Code Documentation: Required @desc tag not missing
}}}


==== Documented But Nonexistent Parameters ====

If on the other hand a tagged description is present for a formal parameter that is not (or no longer) a part of the module definition, a warning will be issued with details of the occurrence.

'''Example'''
{{{
/*
 * @param a Description of a
 * @param b Description of b
*/
function f1(boolean b){
     ...
}
}}}

results in

{{{
testFile.ttcn: 31: WARNING: Documented parameter not found: a
}}}

==== Cyclic Imports ====

In addition to the pure documentation-related checks, there is currently also a cyclic imports check, which throws warnings if cyclic imports occur. This is of particular importance for the import view, since cyclic dependencies will be impossible to represent with the current presentation format. Cyclic imports shall also be detected by most compilers since there are a lot more problems associated with them. The warning contains the cyclic import and there is a separate warning for each module that is part of the cycle.

'''Example'''
{{{
module mod1{
    import mod2;
}
module mod2{
    import mod3;
}
module mod3{
    import mod1;
}
}}}

produces three warnings

{{{
mod1.ttcn: 1: WARNING: Cyclic imports found: mod1 -> mod2 -> mod3 -> mod1
mod2.ttcn: 1: WARNING: Cyclic imports found: mod2 -> mod3 -> mod1 -> mod2
mod3.ttcn: 1: WARNING: Cyclic imports found: mod3 -> mod1 -> mod2 -> mod3
}}}