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title: "Expressions in Group Definitions"
canonical: "https://docs.infoblox.com/space/netmri754/105944138/Expressions%20in%20Group%20Definitions"
format: markdown
---
Group membership expressions consist of one or more logical sub-expressions (for example, `equals, like, in`), acting on a set of variables (e.g., `$Name`, `$Type`) evaluated by boolean operators (for example, `and, or, =>, <=)`. You can specify any logical membership criteria using sub-expression combinations. Some variables are defined only for certain types of criteria expressions.