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// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
//! Glance Metadefs
use ;
use AsyncOpenStack;
use crate::;
/// Metadefs
///
/// The Metadata Definitions Service (“metadefs”, for short) provides a common API for vendors,
/// operators, administrators, services, and users to meaningfully define available key:value pairs
/// that can be used on different types of cloud resources (for example, images, artifacts,
/// volumes, flavors, aggregates, and other resources).
///
/// To get you started, Glance contains a default catalog of metadefs that may be installed at your
/// site; see the README in the code repository for details.
///
/// Once a common catalog of metadata definitions has been created, the catalog is available for
/// querying through the API. Note that this service stores only the catalog, because metadefs are
/// meta-metadata. Metadefs provide information about resource metadata, but do not themselves
/// serve as actual metadata.
///
/// Actual key:value pairs are stored on the resources to which they apply using the metadata
/// facilities provided by the appropriate API. (For example, the Images API would be used to put
/// specific key:value pairs on a virtual machine image.)
///
/// A metadefs definition includes a property’s key, its description, its constraints, and the
/// resource types to which it can be associated. See [Metadata Definition
/// Concepts](https://docs.openstack.org/glance/latest/user/metadefs-concepts.html) in the Glance
/// Developer documentation for more information.
///
/// **Note**: By default, only admins can manipulate the data exposed by this API, but all users
/// may list and show public resources. This changed from a default of “open to all” in the Wallaby
/// release.
/// Supported subcommands