AU Patient Summary Implementation Guide
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## General Requirements

Page standards status: Informative

### Conforming to AU Patient Summary

TBD.

The requirements of the FHIR standard and FHIR Conformance Rules apply, and define the use of terms in this guide including the conformance verbs - SHALL, SHALL NOT, SHOULD, SHOULD NOT, MAY.

Implementers are advised to be familiar with the requirements of the FHIR standard and IPS when implementing AU PS, in particular:

- IPS Generation and Data Inclusion
- IPS Narrative and Language Translation
- FHIR Terminology requirements
- FHIR RESTful API
- FHIR Search
- FHIR Resource formats
- FHIR Data Types

### Conformance Artifacts

#### AU PS Profiles and Extensions

The Profiles and Extensions page lists the AU PS profiles and extensions defined for this implementation guide. An AU PS profile StructureDefinition defines the minimum elements, extensions, vocabularies and value sets that SHALL be present and constrains the way elements are used when conforming to the profile.

AU PS profile elements include mandatory and Must Support requirements. Mandatory elements are required and have a minimum cardinality of 1 (min=1). Must Support elements have defined conformance obligations in AU PS.

### Mandatory Elements

Mandatory elements are elements with minimum cardinality > 0. When an element is mandatory, the data is expected to always be present. Very rarely, it may not be, and in this circumstance the requirements defined by AU Core for Missing Data SHALL be applied.

An element can be both Must Support and mandatory, in which case the requirements defined by AU Core for mandatory’s Missing Data requirements SHALL be applied as described in Missing Must Support and Mandatory Data.

The convention in this guide is to mark all mandatory elements as Must Support unless they are nested under an optional element.

### Must Support and Obligation

Labelling an element Must Support means that systems that produce or consume resources SHALL provide support for the element in some meaningful way. The FHIR standard does not define exactly what ‘meaningful’ support for an element means, but indicates that a profile SHALL make clear exactly what kind of support is required when an element is labelled as Must Support.

TBD - to add defined and agreed actors.

#### Presentation of Must Support and obligation in profiles

TBD

#### Interpreting profile elements labelled Must Support

TBD

### Missing Data

There are situations when information for a particular data element is missing and the source system does not know the reason for the absence of data.

#### Missing Must Support and Optional Data

If the source system does not know the value for an optional element (minimum cardinality = 0), including elements labelled Must Support, as per the requirements defined in AU Core, the data element SHALL be omitted from the resource.

#### Missing Must Support and Mandatory Data

If the data element is a mandatory element (minimum cardinality is > 0), the element SHALL be present even if the source system does not know the value or the reason the value is absent and the requirements defined by AU Core for Missing Must Support and Mandatory Data SHALL be applied.

### Suppressed Data

In some circumstances, specific pieces of data may be hidden due to security or privacy reasons and in these circumstances the requirements defined by AU Core for Suppressed Data SHALL be applied.