ECS 3.6.2 Data Access Guide

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ECS system metadata and optional attributes

System metadata is automatically associated with each object stored in the object store. Some system metadata is always populated and can be used as index keys, other metadata is not always populated but, where present, can be returned with metadata search query results.

System metadata

Table 1. System Metadata The system metadata listed in the table below can be used as keys for metadata search indexes.
Name (Alias)	Type	Description
ObjectName	string	Name of the object.
Owner	string	Identity of the owner of the object.
Size	integer	Size of the object.
CreateTime	datetime	Time at which the object was created.
LastModified	datetime	Time and date at which the object was last modified. NOTE: Modification supported by ECS S3 byte-range update extensions, not by pure S3 API.

Optional metadata attributes

Optional system metadata attributes may or may not be populated for an object, but can be optionally returned along with search query results. The optional system metadata attributes are listed in the table below.

Table 2. Optional metadata attributesThe Table lists the Optional Metadata attributes
Name (Alias)	Type
ContentType	string
Expiration	datetime
ContentEncoding	string
Expires	datetime
Retention	integer