From GridLAB-D Wiki
collection - Object collections
Several objects use collections as a property to help find objects that satisfy certain criteria. Collections are typically built at initialization, although that can be run at any during a simulation if needed.
A collection is specified as string with one or more filtering elements. For example,
class=house
would collect all the objects that have the class house.
Only properties that are invariant during a simulation may be used in a collection. The following properties are supported:
- id
- class
- isa
- module
- groupid
- rank
- parent
- insvc
- name
- latitude
- longitude
- clock
- insvc
- outsvc
- flags
The following operators are supported:
- AND (can also be written as "and" or ";")
Note that the "OR" operator is not supported at this time.