Capabilities

FHIR ANT implements a broad set of the FHIR R4 specification. Here's what's supported.

FHIR REST API

CRUD Operations

Operation	Method	Endpoint	Notes
Create	POST	/<type>	Auto-generates ID if not provided
Read	GET	/<type>/<id>
Update	PUT	/<type>/<id>	Auto-versions with timestamp
Patch	PATCH	/<type>/<id>	JSON Patch (RFC 6902)
Delete	DELETE	/<type>/<id>
Conditional Create	POST	/<type>	Via If-None-Exist header
Conditional Update	PUT	/<type>/<id>	Via If-Match header
Conditional Delete	DELETE	/<type>	Via query parameters

Search

Feature	Details
GET search	GET /<type>?param=value
POST search	POST /<type>/_search
System search	POST /_search (requires _type)
String params	Starts-with matching
Token params	system|code, :text, :in, :not-in, :of-type modifiers
Reference params	Direct and chained (.), reverse chaining (_has)
Date params	eq, ne, lt, gt, le, ge, sa, eb, ap prefixes
Number params	Numeric prefixes
Quantity params	Value, system, code
URI params	:above, :below modifiers
Composite params	Multiple components
_include	Forward includes with :iterate and wildcard (*)
_revinclude	Reverse includes with :iterate and wildcard (*)
_sort	Single and multi-field sorting
_count / _offset	Pagination
_total	none, estimate, accurate
_summary	true, false, text, data, count
_elements	Return only specified fields (adds SUBSETTED tag)

History

Endpoint	Description
GET /<type>/<id>/_history	Instance history
GET /<type>/<id>/_history/<vid>	Version read
GET /<type>/_history	Type history
GET /_history	System history
_since / _at parameters	Filter by date

Bundles

• Transaction bundles — atomic, all-or-nothing with urn:uuid resolution
• Batch bundles — independent operations
• Full urn:uuid cross-reference resolution within transactions

Compartments

Compartment	$everything	Compartment Search
Patient	Yes	Yes
Encounter	Yes	Yes
Practitioner	Yes	Yes
RelatedPerson	Yes	Yes
Device	Yes	Yes

Operations

Operation	Endpoint	Description
$validate	POST /$validate, POST /<type>/$validate	Resource validation
$everything	GET /<type>/<id>/$everything	Patient/compartment everything
$document	GET /Composition/<id>/$document	Generate document Bundle
$meta	GET /<type>/<id>/$meta	Get resource metadata
$meta-add	POST /<type>/<id>/$meta-add	Add metadata
$meta-delete	POST /<type>/<id>/$meta-delete	Remove metadata
$fhirpath	GET/POST /$fhirpath	Evaluate FHIRPath expressions
$transform	POST /$transform	FHIR Mapping Language transforms
$backup	POST /$backup	Export all data as FHIR Bundle
$restore	POST /$restore	Import data from FHIR Bundle

Terminology

Operation	Endpoint
$validate-code	GET/POST /CodeSystem/<id>/$validate-code
$validate-code	GET/POST /ValueSet/<id>/$validate-code
$lookup	GET/POST /CodeSystem/<id>/$lookup
$expand	GET/POST /ValueSet/<id>/$expand

Instance-level and type-level variants are both supported.

Bulk Data Export

Endpoint	Description
GET /$export	System-level export
GET /Patient/$export	Patient-level export
GET /Group/<id>/$export	Group-level export
GET /$export-poll-status/<id>	Poll export status
DELETE /$export-poll-status/<id>	Cancel export
GET /$export-file/<id>/<file>	Download NDJSON file

Supports _type, _since, _typeFilter, and _outputFormat parameters.

Content Negotiation

• Accept: application/fhir+json (default)
• _format parameter
• _pretty=true for formatted output
• Prefer: return=minimal, return=representation, return=OperationOutcome, respond-async
• If-Modified-Since, If-None-Match, If-Match headers

Metadata

• GET /metadata — Full CapabilityStatement with all supported resources, search parameters, operations, and security information
• GET /.well-known/smart-configuration — SMART on FHIR discovery document
• GET /health — Server health check (status, uptime, database connectivity)