API naming convention
Xpress Nonlinear has been developed as an extension to the XPRS library building on the SLP solver technology, which is reflected in the naming convention. All XPRS API functions are used the same way as normal to build the linear part of the problem, while the API functions prefixed with XSLP are used for all nonlinear aspects, independently of how the problem is solved afterwards (convex quadratic problems by a dedicated solver or Knitro instead of SLP). Some controls have both an XPRS and an XSLP counterpart, for example "XPRS_PRESOLVE" and "XSLP_PRESOLVE". In such cases, "XSLP_PRESOLVE" refers to the nonlinear presolver (even if another solver than SLP is used to solve the problem afterwards) and "XPRS_PRESOLVE" refers to problems that are not deemed as general nonlinear (LP, MIP or convex quadratic); in such cases, if SLP solves one of such problems as part of its iterative process, the XPRS control is respected for such sub-solves.
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