gnodet commented on code in PR #1061:
URL: https://github.com/apache/maven/pull/1061#discussion_r1142090120


##########
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:
   I agree, I'll remove all references to `maven.rootdir` and `maven.topdir`.  
It makes sense to keep `session.rootdir` and `session.topdir` because they are 
available from those objects.
   I'd rather [set them as `session.rootdir` and `session.topdir` in the 
request system 
properties](https://github.com/apache/maven/pull/1061/files#diff-b8b814f5b6b3855ae79dc45a0266b94871193dcef42803c316e07409e94af35cR612-R617).
  That would allow using them in the context of [arguments interpolation / 
`MNG-6303`](https://github.com/apache/maven/pull/1062). 



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