API Reference > presentation-common > Core Core Common types used all across Presentation packages. Classes Name Description KeySet A class that holds multiple KeySet.Key objects. PresentationError An error type thrown by Presentation APIs. RegisteredRuleset A ruleset that is registered in a ruleset manager. RulesetsFactory A factory class that can be used to create presentation rulesets targeted towards Enumerations Name Description LoggingNamespaces Enum of logging namespaces used by Presentation library. PresentationStatus Status codes used by Presentation APIs. RequestPriority Enumeration of standard request priorities. Beta VariableValueTypes Possible variable value types Beta Global Functions Name Description getInstancesCount Get total number of instances included in the supplied key set. Interfaces Name Description ContentRequestOptions Request type for content requests EnumerationChoice A single choice in enumeration EnumerationInfo Enumeration information HierarchyRequestOptions Request type for hierarchy requests InstanceKeyJSON A serialized version of InstanceKeyJSON.InstanceKey KeySetJSON A data structure of serialized KeySet KindOfQuantityInfo Kind of quantity information LabelRequestOptions Request type for label requests PageOptions Paging options PersistentKeysContainer Persistent data structure that holds identity information RequestOptions A generic request options type used for both hierarchy and content requests RequestOptionsWithRuleset Options for requests that require presentation ruleset. RulesetVariable Data structure for representing ruleset variable. Beta SelectionScopeRequestOptions Request options used for selection scope related requests ValuesDictionary A dictionary data structure. Namespaces Name Description ClassInfo InstanceKey Key PropertyInfo RelatedClassInfo RelationshipPath Type Aliases Name Description ClassId Type of an ECClass ID. ComputeDisplayValueCallback Definition of a function for calculating a display value. InstanceId Type of an ECInstance ID. Keys A type for multiple keys that identify something in iModel.js application Omit Create a type with T properties excluding properties listed in K. Paged A wrapper type that injects PageOptions into supplied type Subtract Create a type with T properties excluding all properties in type K. VariableValue Union of all supported variable value types Beta Last Updated: 13 June, 2024