Minor changes in (new) Section 8.3.4 Business Service

Better readability:

From "A business service represents explicitly defined behavior that a business role, business actor, or business collaboration exposes to its environment." to "A business service represents explicitly defined behavior that a business internal active structure elements expose to its environment."

From "A business service exposes the functionality of business roles or collaborations to their environment." to "A business service exposes the functionality of internal active structure elements to their environment."

From "A business service may serve business, application, and technology behavior or active structure elements" to "A business service may serve business, application, and technology internal behavior or internal active structure elements"

From "A business process, business function, or business interaction may realize a business service." to "A business internal behaviour may realize a business service."