public BuildChoose (XmlElement xmlElement, Project project)
		{
			this.xmlElement = xmlElement;
			this.project = project;
			this.whens = new List <BuildWhen> ();

			foreach (XmlNode xn in xmlElement.ChildNodes) {
				if (!(xn is XmlElement))
					continue;

				XmlElement xe = (XmlElement)xn;

				if (xe.Name == "When") {
					if (otherwise != null)
						throw new InvalidProjectFileException ("The 'Otherwise' element must be last in a 'Choose' element.");
					if (xe.Attributes.GetNamedItem ("Condition") == null)
						throw new InvalidProjectFileException ("The 'When' element requires a 'Condition' attribute.");
					BuildWhen bw = new BuildWhen (xe, project);
					whens.Add (bw);
				} else if (xe.Name == "Otherwise") {
					if (this.whens.Count == 0)
						throw new InvalidProjectFileException ("At least one 'When' element must occur in a 'Choose' element.");
					
					otherwise = new BuildWhen (xe, project);
				}
			}
		}
        internal BuildChoose(XmlElement xmlElement, Project project, ImportedProject importedProject)
        {
            //this.xmlElement = xmlElement;
            //this.project = project;
            //this.importedProject = importedProject;
            this.whens = new List <BuildWhen> ();

            foreach (XmlNode xn in xmlElement.ChildNodes)
            {
                if (!(xn is XmlElement))
                {
                    continue;
                }

                XmlElement xe = (XmlElement)xn;

                if (xe.Name == "When")
                {
                    if (otherwise != null)
                    {
                        throw new InvalidProjectFileException("The 'Otherwise' element must be last in a 'Choose' element.");
                    }
                    if (xe.Attributes.GetNamedItem("Condition") == null)
                    {
                        throw new InvalidProjectFileException("The 'When' element requires a 'Condition' attribute.");
                    }
                    BuildWhen bw = new BuildWhen(xe, project);
                    whens.Add(bw);
                }
                else if (xe.Name == "Otherwise")
                {
                    if (this.whens.Count == 0)
                    {
                        throw new InvalidProjectFileException("At least one 'When' element must occur in a 'Choose' element.");
                    }

                    otherwise = new BuildWhen(xe, project);
                }
            }

            DefinedInFileName = importedProject != null ? importedProject.FullFileName :
                                project != null ? project.FullFileName : null;
        }