Пространство имен Bitrix\UI\EntitySelector

Классы
class	BaseFilter
class	BaseProvider
class	Configuration
class	Dialog
class	Entity
class	FilterControllerResolver
class	Item
class	ItemCollection
class	NodeOptions
class	PreselectedCollection
class	PreselectedItem
class	RecentCollection
class	RecentItem
class	SearchQuery
class	Tab
class	TextNode
class	TextNodeType