Defines a subdirectory within an IIS web site. When this element is a child of WebSite, the web directory is defined within that web site. Otherwise the web directory must reference a WebSite element via the WebSite attribute. Extensibility point in the WiX XML Schema. Schema extensions can register additional elements at this point in the schema. Identifier for the web application. If the Id is not specified, it will be generated. References the Id attribute for a WebApplication element in which this directory belongs. References the Id attribute for a WebSite element in which this directory belongs. Required when this element is not a child of a WebSite element. Specifies the name of this web directory. References the Id attribute for a WebDirProperties element that specifies the security and access properties for this web directory. This attribute may not be specified if a WebDirProperties element is directly nested in this element. Extensibility point in the WiX XML Schema. Schema extensions can register additional attributes at this point in the schema.