gnodet commented on code in PR #1061:
URL: https://github.com/apache/maven/pull/1061#discussion_r1142256086


##########
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:
   > ? `topdir` should be available in interpolation, it is its main usage to 
reference absolutely configurations otherwise not sure its interest for end 
users.
   
   No, that's would be the `rootdir`.  The `topdir` would be defined as the the 
top-most directory of executed projects in the reactor (basically, the current 
directory or the one pointed to when using `-f`/`--file`).



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