The classification specifications are not to be considered restrictive nor construed as limiting the duties and responsibilities of any position. They neither limit nor modify the authority of any City official to assign duties to, direct, and control the work of employees in the City service. However, no employee shall be required to perform duties of a position outside of the classification to which they have been appointed, except on a temporary basis. The classification specifications are descriptive and explanatory of characteristic duties and responsibilities of positions in a classification and, as such, they are to be interpreted in their entirety and in relation to other classifications in the classification plan.