Determines how a property is resolved. Immediate means the value is included in the XML document and cannot be changed by the user. User means the value must be obtained from the user. Optional means the user is given the opportunity to supply a value, but can leave the entry blank. Dependent means the value depends on the value of other properties. A dependency expression must be supplied in the dependency attribute. Generated means the value will be provided by a generator. Property value is included in the XML file. It cannot be configured. Property content can be modified through confiugration. Modifications will be saved with the design. Property value is expressed as an XPath expression which may refer to other properties. The expression must appear in the dendency attribute. Generators may modify this property. Modifications get saved with the design. Determines how a property value is resolved. ID attribute for uniquely identifying an element within its document. Required on properties with a resolve = "dependent" attribute. This is an XPath expression supplying the resultant value in terms of other properties in the component file. Base set of attributes for an element to be configurable.