[Enter description of this extension point.] project nature ids associated with this provider. IDs are separated by the semicolon. Each time the Build Active configuration gets changed, the project natures set gets adjusted by removing natures associated with the previously active configuration and adding natures associated with the new actove configuration. This allows to adjust, e.g. the builders to be used with the project, etc. class implementing the org.eclipse.cdt.core.settings.model.extension.CConfigurationDataProvider project nature ids to be unset for this provider. IDs are separated by the semicolon. Each time the Build Active configuration gets changed, the project natures set gets adjusted by removing natures associated with the previously active configuration and natures conflicting for the new active configuration and adding natures associated with the new active configuration. This allows to adjust, e.g. the builders to be used with the project, etc. [Enter the first release in which this extension point appears.] [Enter extension point usage example here.] [Enter API information here.] [Enter information about supplied implementation of this extension point.]