java - Maven model<modelVersion> version control? -

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i know model 2.x maven 4.0.0. here want ask

  1. how changed in future.
  2. what purpose of tag.

from http://maven.apache.org/guides/getting-started/:

modelversion element indicates version of object model pom using. version of model changes infrequently is mandatory in order ensure stability of use if , when maven developers deem necessary change model.

the "model" refers structure of pom.xml itself, i.e. elements allowed/mandatory, how interpret them, etc.


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