Biztalk Business Rule Engine

No. After policies are published it can't be edited. But if there is a need to have a change in policy then new version of policy is to be created.

This database is a repository for:

☛ Policies, which are sets of related rules

☛ Vocabularies, which are collections of user-friendly, domain-specific names for data references in rules.

Transformations are more flexible and fast when they are executed from a send or receive port. We can replace map on the ports without any development effort. But if we replace map in orchestration we have to recompile and redeploy the orchestration assembly.

The mapper grid plays a critical role in the definition of maps, containing the links and functoids that control how data in a source instance message is transformed into an instance message that conforms to the destination schema.

The grid view can have multiple layers, called grid pages, allowing you to organize complex maps into logical subdivisions of mappings. BizTalk 2010 no longer has the limitation of 20 grid pages that exist in the previous versions of the product.

No there is no limit for versions of policies

Click on the map grid and in properties tab specify the location where custom XSLT is stored against the property "Custom XSLT path".