Workflow
Liferay DXP ships with a workflow engine that allows reviewing and approving content such as Blogs, Web Content, or Wikis before publication. Define any number of business processes/workflows, deploy them, and manage them through a portal interface.
Developer Guide
Implementing Workflow Implementing a Custom SLA Calendar Crafting XML Workflow Definitions Using the Script Engine in Workflow Workflow Definition Node Reference Workflow Task Node Reference Workflow Notification Template Variables Creating a Condition Evaluator Creating an Action Executor Working with Workflow Context APIs