---
layout: default
navsection: api
+navmenu: Concepts
title: Resources
navorder: 4
---
h2. Attributes of resources
table(table table-bordered table-condensed).
-|*Attribute name*|*Value*|*Description*|*Example*|
+|*Attribute*|*Type*|*Description*|*Example*|
|uuid|string|universally unique object identifier|@mk2qn-4zz18-w3anr2hk2wgfpuo@|
+|href|string|a URL that can be used to address this resource||
|kind|string|@arvados#{resource_type}@|@arvados#collection@|
|etag|string|The ETag[1] of the resource|@1xlmizzjq7wro3dlb2dirf505@|
|self_link|string|||
|owner_uuid|string|UUID of owner (typically User or Project)|@mk2qn-tpzed-a4lcehql0dv2u25@|
|created_at|datetime|When resource was created|@2013-01-21T22:17:39Z@|
-|modified_by_client|string|API client software which most recently modified the resource|@mk2qn-ozdt8-vq8l5qkzj7pr7h7@|
-|modified_by_user|string|Authenticated user, on whose behalf the client was acting when modifying the resource|@mk2qn-tpzed-a4lcehql0dv2u25@|
+|modified_by_client_uuid|string|API client software which most recently modified the resource|@mk2qn-ozdt8-vq8l5qkzj7pr7h7@|
+|modified_by_user_uuid|string|Authenticated user, on whose behalf the client was acting when modifying the resource|@mk2qn-tpzed-a4lcehql0dv2u25@|
|modified_at|datetime|When resource was last modified|@2013-01-25T22:29:32Z@|
h2. Attributes of resource lists
table(table table-bordered table-condensed).
-|*Attribute name*|*Value*|*Description*|*Example*|
+|*Attribute*|*Type*|*Description*|*Example*|
|kind|string|@arvados#{resource_type}_list@|@arvados#project_list@|
|etag|string|The ETag[1] of the resource list|@cd3o1wi9sf934saajykawrz2e@|
|self_link|string|||