Bug 197589 Need constant for automaic attribute name "DateTime"
Currently when set dateTimeLevelType for cube level, model will automatically create a built-in attribute "DateTime". But the name is hard-coded. We need a public constant for this name to allow UI to access it.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/PropertyCommand.java
import java.util.List;
import org.eclipse.birt.report.model.activity.ActivityStack;
import org.eclipse.birt.report.model.api.CommandStack;
import org.eclipse.birt.report.model.api.DesignElementHandle;
import org.eclipse.birt.report.model.api.GroupHandle;
import org.eclipse.birt.report.model.api.IllegalOperationException;
import org.eclipse.birt.report.model.api.ListingHandle;
import org.eclipse.birt.report.model.api.StructureFactory;
import org.eclipse.birt.report.model.api.activity.SemanticException;
import org.eclipse.birt.report.model.api.command.CssException;
import org.eclipse.birt.report.model.api.command.NameException;
import org.eclipse.birt.report.model.api.command.PropertyNameException;
import org.eclipse.birt.report.model.api.core.IModuleModel;
import org.eclipse.birt.report.model.api.elements.DesignChoiceConstants;
import org.eclipse.birt.report.model.api.elements.SemanticError;
import org.eclipse.birt.report.model.api.elements.structures.LevelAttribute;
import org.eclipse.birt.report.model.api.elements.structures.OdaLevelAttribute;
import org.eclipse.birt.report.model.api.elements.structures.TOC;
import org.eclipse.birt.report.model.api.extension.ExtendedElementException;
import org.eclipse.birt.report.model.api.extension.IReportItem;
import org.eclipse.birt.report.model.api.metadata.IPropertyType;
import org.eclipse.birt.report.model.api.metadata.PropertyValueException;
import org.eclipse.birt.report.model.api.util.StringUtil;
import org.eclipse.birt.report.model.api.validators.GroupNameValidator;
import org.eclipse.birt.report.model.core.CachedMemberRef;
import org.eclipse.birt.report.model.core.ContainerContext;
import org.eclipse.birt.report.model.core.DesignElement;
import org.eclipse.birt.report.model.core.MemberRef;
import org.eclipse.birt.report.model.core.Module;
import org.eclipse.birt.report.model.core.Structure;