Bug 183918 get relative file path of linkage library
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/library/DesignLoadLibraryTest.java
import org.eclipse.birt.report.model.api.IncludedLibraryHandle;
import org.eclipse.birt.report.model.api.LabelHandle;
import org.eclipse.birt.report.model.api.LibraryHandle;
import org.eclipse.birt.report.model.api.PropertyHandle;
import org.eclipse.birt.report.model.api.ReportDesignHandle;
import org.eclipse.birt.report.model.api.ReportElementHandle;
import org.eclipse.birt.report.model.api.RowHandle;
import org.eclipse.birt.report.model.api.SharedStyleHandle;
import org.eclipse.birt.report.model.api.SimpleMasterPageHandle;
import org.eclipse.birt.report.model.api.SlotHandle;
import org.eclipse.birt.report.model.api.StructureHandle;
import org.eclipse.birt.report.model.api.StyleHandle;
import org.eclipse.birt.report.model.api.TableHandle;
import org.eclipse.birt.report.model.api.activity.SemanticException;
import org.eclipse.birt.report.model.api.command.LibraryException;
import org.eclipse.birt.report.model.api.elements.DesignChoiceConstants;
import org.eclipse.birt.report.model.api.elements.structures.ConfigVariable;
import org.eclipse.birt.report.model.api.elements.structures.CustomColor;
import org.eclipse.birt.report.model.api.elements.structures.EmbeddedImage;
import org.eclipse.birt.report.model.api.elements.structures.IncludedLibrary;
import org.eclipse.birt.report.model.api.metadata.PropertyValueException;
import org.eclipse.birt.report.model.core.Module;
import org.eclipse.birt.report.model.core.NameSpace;
import org.eclipse.birt.report.model.elements.Label;
import org.eclipse.birt.report.model.elements.Library;
import org.eclipse.birt.report.model.elements.ReportDesign;
import org.eclipse.birt.report.model.elements.SimpleDataSet;
import org.eclipse.birt.report.model.elements.Style;
import org.eclipse.birt.report.model.elements.TableItem;
import org.eclipse.birt.report.model.elements.interfaces.IDesignElementModel;