## Definition of a marketplace package release

Definition of a marketplace package release, which represents a specific release of a package that can be installed and used by a system.

### Elements

| Name | Required | Type | Description |
| --- | --- | --- | --- |
| identifier |  | [Identifier](/content/docs/api/fhir/datatypes/identifier/index.html)[] | An identifier for this package release<br>Details<br>An identifier for this package release. |
| package | ✓ | Reference< [Package](/content/docs/api/fhir/medplum/package/index.html) > | Details<br>The Package of this release. |
| version | ✓ | string | Details<br>The version of the PackageRelease. |
| description |  | markdown | Details<br>A summary, characterization or explanation of the PackageRelease. |
| content | ✓ | [Attachment](/content/docs/api/fhir/datatypes/attachment/index.html) | Details<br>The actual content of the package release. |

### Search Parameters

| Name | Type | Description | Expression |
| --- | --- | --- | --- |
| package | reference | The Package of the package release | PackageRelease.package |
| version | token | The version of the package release | PackageRelease.version |

### Inherited Elements

| Name | Required | Type | Description |
| --- | --- | --- | --- |
| id |  | string | Logical id of this artifact<br>Details<br>The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes. |
| meta |  | [Meta](/content/docs/api/fhir/datatypes/meta/index.html) | Details<br>The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource. |
| implicitRules |  | uri | Details<br>A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc. |
| language |  | code | Details<br>The base language in which the resource is written. |
| text |  | [Narrative](/content/docs/api/fhir/datatypes/narrative/index.html) | Text summary of the resource, for human interpretation<br>Details<br>A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety. |
| contained |  | Resource[] | Details<br>These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope. |
| extension |  | [Extension](/content/docs/api/fhir/datatypes/extension/index.html)[] | Additional content defined by implementations<br>Details<br>May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| modifierExtension |  | [Extension](/content/docs/api/fhir/datatypes/extension/index.html)[] | Extensions that cannot be ignored<br>Details<br>May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.