Microsoft elaborates on Oslo modeling approach

User feedback will help determine overall road map, Microsoft promises

Shedding more light on its Oslo vision for model-based software development, Microsoft this week elaborated on plans to preview Oslo technologies, offering code names and citing the company's DSL (Domain Specific Languages) concept as a lynchpin of the platform.

A Community Technology Preview of Oslo is due at the Microsoft Professional Developers Conference in Los Angeles on Oct. 27. A declarative modeling language now being identified by the code name, "M," as well as a software modeling tool code-named Quadrant, will be featured in the CTP.

A repository for integration between models will also be part of the CTP. User feedback on the CTP will help determine the overall road map for Oslo technologies, said Robert Wahbe, Microsoft corporate vice president of the company's connected systems division, during an interview this week.

With Oslo, Microsoft seeks to provide another layer of abstraction for developers and to make development easier; models become the applications. Business analysts could also make changes to models. For example, an analyst could change an application that requires two managers' approvals for lunch expenses exceeding $100 to requiring these approvals for a $50 lunch, Wahbe said.

"It's easier in many cases to look at a model and see what it's trying to do rather than look at hundreds of thousands of lines of code," Wahbe said.

With the M language, ISVs and developers could build textual DSLs, he said. A DSL enables a developer to write down intent in a way that is close to how a developer is thinking about a problem, Wahbe said. M can also be used to build data models.

"The idea of DSLs has been around. What we're trying to do with Oslo is make it easier for mainstream developers to use models in general," Wahbe said. Microsoft, as an ISV itself, will use DSLs for building domains for activities like workflow and databases.

The notion is that "M is excellent at building these DSLs in an easy way," Wahbe said. "In turn, once you have that DSL, what it does is it lets you produce something that the platform can execute directly."

A model is translated to XAML, which can be executed by the platform. Oslo also can work with multiple runtimes from platforms like Java if developers customize the Oslo tools.

Quadrant, meanwhile, provides a way to author models visually. "The way to think about it is M lets you build textual DSLs and Quadrant lets you build visual DSLs," Wahbe said.

Oslo will be featured as part of the Visual Studio product family; the company has not yet announced which version would include Oslo. While Oslo at first glance might appear to be minimizing the role of the developer by raising the level of abstraction, Microsoft believes it is just a natural step in the evolution of software development that does not put developers' jobs at risk, Wahbe said.

"Developers can deliver higher-quality applications faster," he said.

With Oslo, Microsoft has "definitely raised the bar," said analyst Nick Gall, an analyst at Gartner Inc. "The Oslo approach to modeling is a refreshing new approach. That said, it is ambitious," Gall said.

"Any attempt to do really do model-driven architecture is ambitious. We've been trying to do executable models for 25-plus years, and all to date have failed," such as with CASE (Computer Aided Software Engineering) and Object Modeling Group efforts, said Gall.

Microsoft is attacking the two core issues of modeling: translating from models into executable code and the functional aspect of an application, in which functional models must accommodate nonfunctional aspects of an application such as security and systems management, Gall said. Microsoft has not yet completed the integration with nonfunctional models, he said.

Oslo integrates with existing applications, according to Microsoft. It brings together a connected view of models and builds on existing investments on top of the Microsoft platform. Microsoft is also working with ISVs on products built using Oslo, including line-of-business applications and DSLs, the company said.

This story, "Microsoft elaborates on Oslo modeling approach" was originally published by InfoWorld.

Copyright © 2008 IDG Communications, Inc.

7 inconvenient truths about the hybrid work trend
Shop Tech Products at Amazon