Referencing Objects in Expressions

Design objects have a domain prefix that allows you to directly or indirectly reference a design object or invoke object properties. See Domain Prefixes for more information.

The following table list the various design objects with their prefixes:

Design Object	Domain Prefix	Reference Type	Use Case
Constants	cons!	Indirect	Use this domain to indirectly reference a design object. See Call a Constant from an Expression for more information.
Data Types	type!	Direct	Use this domain to reference an Appian data type or custom data types. See Construction Data Type Values for examples on how to use this prefix. See Data prefixes for information on which data prefixes to use to invoke stored data values in an expression.
Decisions	rule!	Indirect	Use this domain to indirectly reference an expression rule, an interface, a decision, and an integration. See Call a decision from another expression for more information.
Expression Rules	rule!	Indirect	Use this domain to indirectly reference an expression rule, an interface, a decision, and an integration. See Call an expression rule from another expression for more information.
Integrations	rule!	Indirect	Use this domain to indirectly reference an expression rule, an interface, a decision, and an integration. See Call an integration to query data for more information.
Interfaces	rule!	Indirect	Use this domain to indirectly reference an expression rule, an interface, a decision, and an integration. See Interfaces as rules for more information.
Portal	portal!	Direct	Use this domain to reference a portal object and any portal pages. See Reference a portal object for more information.
Record Type	recordType!	Direct	Use this domain to reference a record object type and any properties of the record type like fields, actions, filters, and relationships. See Reference a record type and its properties for more information.

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