rmannibucau commented on code in PR #1061:
URL: https://github.com/apache/maven/pull/1061#discussion_r1149298654


##########
maven-model-builder/src/site/apt/index.apt:
##########
@@ -192,6 +192,10 @@ Maven Model Builder
 *----+------+------+
 | <<<maven.home>>> | The path to the current Maven home. | 
<<<$\{maven.home\}>>> |
 *----+------+------+
+| <<<maven.rootdir>>> | the directory containing the root <<<pom.xml>>> file 
of a multi module project, in a single module project this is the same as 
<<<project.basedir>>> | <<<$\{maven.rootdir\}>>> |
+*----+------+------+
+| <<<maven.topdir>>> | the directory containing the top-level <<<pom.xml>>> in 
this reactor build | <<<$\{maven.topdir\}>>> |
+*----+------+------+

Review Comment:
   what's the point of topdir then? it does not have to match cwd nor the 
rootdir so sounds like a randomdir at usage



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