w6et commented on PR #1061:
URL: https://github.com/apache/maven/pull/1061#issuecomment-1474183673

   > > > Do these three properties represent the same value?
   > > 
   > > 
   > > I suppose you're talking about `topdir`, `project.topdir` and 
`session.topdir` ? They are aliases, but I don't think the `project.topdir` is 
a good idea, since it's not really a project attribute.
   > > I'm still thinking about renaming the new property to `rootdir`, and 
introduce a `topdir` for the execution directory in a consistent way. And 
deprecate `MavenSession.getExecutionRootDirectory()`, 
`MavenExecutionRequest.getBasedir()`, 
`MavenExecutionRequest.getMultiModuleProjectDirectory()` accordingly. I'm open 
to any naming, but things are a bit inconsistent, so I'd rather fix it.
   > 
   > just another idea,Maybe we can define build.json(like npm's 
package.json),we can init topdir properties and other public properties in the 
build.json,then generate build-lock.json\yaml, every module can use the 
properties from build-lock.json, (BTW, maybe pom.xml->pom-lock.yaml,so only use 
xxx-lock.yaml,so something don't need computed many times) maybe 
dependencies、plugins、repositories ‘s properties can split to different 
properties file,so we can import & share it for different maven project. or all 
in build.json like `{ "name": "my app 001", "version": "0.0.1", "topdir": 
"xxxxx", "mvn.properties": { "java.version":"17", "maven.test.skip":"true" }, 
"dependencies": { "compile": { "default":{ "default is required":"" }, 
"spring":{ "spring-amqp.version":"3.0.2" } } }, "plugins": {
   > 
   > }, "repositories": {
   > 
   > } } `
   
   generated build-lock.json can contains system environment properties or 
something else configuration ,so we can sure the actual 
properties/configuration any which we used


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