9.2 AvailableData
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## 9.2 AvailableData

A data structure that communicates what data is available to the recipient. The data is organized in a hierarchical fashion, communicating patients, studies, series, and finally ObjectDescriptors that identify available data objects. The fields in the data structure are:

- ObjectDescriptors : ObjectDescriptor[] - An array of ObjectDescriptor data structures listing data that either applies to multiple patients, or does not fit into the patient / study / series hierarchy.

- Patients : Patient[] - An array of Patient data structures.

### 9.2.1 ObjectDescriptor

A data structure with the following fields:

- DescriptorUUID : UUID - the UUID that the interface utilizes to track this particular data object.

- MimeType : MimeType - the MIME content type of this particular data object, in its most natural form available from the source. The most natural form is typically the form in which the source maintains the data in its database, for example a DICOM file.

- ClassUID : UID - the UID that represents the class of this data object in the form described by mimeType. For objects whose mimeType refers to a data exchange model such as those defined in Annex A, this is the UID of that model. For objects whose mimeType is application:dicom, this is the SOP Class UID of the DICOM object. This may be empty for those objects whose MIME content types have no additional classes.

- TransferSyntaxUID : UID - the UID that represents the Transfer Syntax of this data object in the form described by mimeType. This may be empty for those objects of a MIME content type where Transfer Syntax has no meaning.

- Modality : String - the modality that best represents where this data originated from. Standard values are drawn from the Defined Terms listed for the Modality (0008,0060) Attribute in the Section C.7.3.1.1.1 “Modality” in PS3.3 .

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