To define a A data entry page , two XML files are required, the component definition XML and the page layout XML.
The definition XML is used to specify the components that will be displayed on the page.
The layout XML is used to specify the order of the components, the screen area of each component and the alignment of the components.is made up of 2 XML files. The layout file and the definition file. In the layout file we determine where to display components and tabs on the screen, and in the definition file we define these components and tabs.