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The following are highlights of this release:
- Solvers
* Interfaces for OpenOpt solvers
* Many solver interface improvements
* A solver checker to validate solver interfaces
* Improved support for SOS constraints (cplex, gurobi)
* PH supports nonlinear models
* PH-specific solver servers
- Modeling
* Changes in rule semantics to limit rule return values
* Changes in the expected order of rule arguments
* Constant sums or products can now be used as constraint bounds
* Added full support for the !ConstraintList modeling component.
- Usability enhancements
* New 'pyomo' command has subcommands that consolidate Pyomo scripting
* Added support to connect to databases with ODBC
* Added comprehensive support for set expressions
* Comprehensive rework of blocks and connectors for modular modeling
* Made JSON the default results format
- Other
* Efficiency improvements in model generation, memory, runtime, etc.
* Preliminary support for black-box applications
* Deprecated modeling syntax in Pyomo 3.0 is no longer legal
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