Tracking project, visualize dependencies, housekeeping tasks.

• Visualize project tasks as nodes, task dependencies as lines between nodes, thus whole project is an Directed Acyclic Graph(DAG).
• Node(task) has customized attributes.
• Can add child node to node, ex: Add a new node B to node A, means Task A depends on Task B, child node inherits all customized attributes of parent node.
• Can link parent node to exist child node, ex: Link node A to node B, means Task A depends on Task B.
• Recursively tracing nodes(parent to children) and apply some aggregate/filter functions(children to parent) upon some atrribute.
• Visualize the above tracing process as animated-updating number/bar/(some chart) on the node.
• Housekeep the project by analyzing each node with some customized Housekeep Rules

• A project, a task, an item, a component, anything that could have dependencies on other nodes.
• A node can has child nodes, and depends on its child nodes.

• Defines a node's property.
• Attribute's value is held in node.
• Attribute's type and label defined in manual.
• Can be bound to a reducing method in manual.

• Attached to a node, used to define the node's attributes, reducing methods, and housekeeping rules.
• If a node doesn't have a manual, the manual of its ascendants which has the shortest path to this node, will apply.

• A group of functions that can be bind to an attribute and used to reduce the attribute's values of child nodes to that of parent node.

• Customized rules to check if a node is in a "health" status.
• If not, mark the node as "unhealthy" and report to user.
• Defined in manual.