The Virgo Tools create Plan projects as special types of Java projects with an additional Virgo-specific nature. Plan files must be created within the source folder(s) of Plan projects.
When a Plan file refers to another Plan file, the Virgo Tools will look for the referred Plan file in the same project of the top-level Plan and in all the Plan projects that are directly or indirectly reachable via the project's Java Build Path. If more than one Plan with the same name is found in the project's Java Build Path, the Virgo Tooling will pick the first found when following the Java Build Path defined class-path order. Note that the Plan is identified by the value of the name attribute of the plan element inside the Plan XML document and not the by the file name.