Additive manufacturing (AM) has various benefits over conventional manufacturing processes, such as producing complex geometries, printing multi-material parts, and parts with variable scales of lattice structures. The design intent should transfer through each step in the AM process planning. The de facto standard file format used in AM is Standard Tessellation Language (STL). However, these STL files hold only geometrical information about the design; other information, such as color, material variations, and structure variations in the design domain, cannot be represented in the existing STL file. Extensible Markup Language (XML) is a human and machine-readable standard representation of information widely used to share information and other descriptions over multiple mediums. We propose an XML schema-based approach in this work to include multi-material information along with geometry in CAD. The proposed approach can eliminate the limitations of the existing file formats used in AM. Current process planning tools can read these files for printing the part effectively. The effectiveness of the proposed approach is assessed with a case study of a wireless mobile charging case with multi-material and different lattice structures and is presented in this work.