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With complex Maven projects, user often works on a subproject, and needs to open the parent project. Currently, the parent project is not reachable from within child project's tree in the Project window. It would be very convenient if NetBeans shown a node representing the parent project or artifact. It may work just like the dependencies: If the parent is a project reachable for NetBeans, it would open the project. If not, it would treat it as an artifact - resolve it it when needed, show the content of the archive, and perhaps download show POM upon request. Additionally, NetBeans could allow to navigate to parent artifact's pom.xml when clicking on the reference in the child pom.xml (<parent> ...). That's for another RFE.
Related to Bug 237354.
there is a navigator panel that lists all parent files for currently selected pom.xml file.