The validation of eva/3 Application Builder
documents is done by the adapted IReferenceBuilder. On reading the
references of a resource it should applay markers (IMarker) to a
resource, when references fail or the content of the resource is not valid.

Fig. 299: Validation of Documents
The applayed markers should extend the eva/3
Application Builder marker
com.odc.eva3.dev.core.markers.marker1. So they can be removed by
the IncrementalEvaDocumentReferenceBuilder on rebuilding an eva/3 Application Builder project.