The flow builder subsystem for building and assembling executable flow definitions.

You construct a Flow using a {@link org.springframework.webflow.engine.builder.FlowBuilder}. This package defines the following flow builder implementations:

- {@link org.springframework.webflow.engine.builder.AbstractFlowBuilder} - A convenience superclass to use when you want to assemble the web flow in Java code.
- {@link org.springframework.webflow.engine.builder.xml.XmlFlowBuilder} - A flow builder that reads an XML file containing a web flow definition and constructs the flow accordingly.

During flow construction, a flow builder may need to access externally managed flow artifacts referenced by the flow definition. The {@link org.springframework.webflow.engine.builder.FlowServiceLocator} fulfills this need, acting as a facade or gateway to an external registry of flow artifacts (such as a Spring Bean Factory).

To direct flow construction, use the {@link org.springframework.webflow.engine.builder.FlowAssembler}. This package is based on the classic GoF Builder design pattern.