因为FocusedEntity只是一个键，所以我们使用通用的xsd：string类型。
Because the FocusedEntity is just a key, we use the generic XSD: string type.
构成给定实体类型的实体键的属性不可更改。
The properties that make up an entity key for a given entity type cannot change.
客户端脚本由它的键和类型唯一标识。
A client script is uniquely identified by its key and its type.
容器的键类型。
具有相同的键和类型的脚本被视为重复脚本。
Scripts with the same key and type are considered duplicates.
将不同属性指定为键属性的匿名类型实例不是同一类型的实例。
GetHashCode for an anonymous type is based on the key properties of the type.
注意：返回的数组将继续保留第一个数组中的所有项的键类型。
Note: the returned array will keep the first array item's key type.
获取当前实体或关系类型的所有键成员的列表。
Gets the list of all the key members for the current entity or relationship type.
获取当前实体或关系类型的所有键成员的列表。
Gets the list of all the key members for the current entity or relationship type.
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