http://chandra.harvard.edu/photo/2002/0057/index.html

Process Specification Language Example

Resource Classes

Class
Property
Range
Domain

Resource Instances

Instance
Grit

Instance
Paint

Instance
PaintBrush

Instance
Paint

Instance
PaintBrush

Instance
SandPaper
grit

Time Points
Time Point

Activity Specifications

Activity
Name
Requires
Consists of

Sub Activity
Name
Requires
Consists of
Sub Activity
Name
Requires

Occurrences

Occurrence

Times
Activity
Begin time
End time
Consists of

Occurrence

Times
Activity
Begin time
End time
Consists of

Occurrence

Times
Activity
Begin time
End time
Consists of