| Code Value | Definition |
|---|---|
| Exponential | An exponential equation. |
| FullRangeFraction | A polynomial equation that includes a scaling factor as the last coefficient, defined as: e/(1-ax). |
| Other | An other unspecified kind of equation. |
| Pade | An equation form as defined in ANSI N42.42, section 5.2.38. |
| PolyLogarithmic | A polylogarithmic equation. |
| Polynomial | An equation of the form a +bX + cX**2 + .. The order of the polynomial is indicated by the number of terms specified in the Coefficients child element. |