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CQL to ELM Translation Service

A microservice wrapper for the CQL to ELM conversion library and CQL formatter.

Build:

mvn package

Execute via the command line:

java -jar target/cqlTranslationServer-2.4.0.jar

NOTE: The cqlTranslationServer jar assumes that all dependency jars are located in a libs directory relative to the jar's location. If you move the jar from the target directory, you will need to move the target/libs directory as well. This project no longer produces an "uber-jar", as the CQL-to-ELM classes do not function properly when repackaged into a single jar file.

Version Table

CQL Translation Service versions prior to version 2.0.0 always mirrored the CQL Tools (CQL-to-ELM translator) version they exposed. Starting with version 2.0.0, semantic versioning is now used. As a result, the version of the CQL Translation Service differs from the version of the CQL Tools that it exposes. The following table shows the relationship between CQL Translation Service releases and CQL Tools releases. Note that prior releases from the MITRE repo are not included here.

CQL Translation Service CQL Tools
2.4.0 3.7.1
2.3.0 3.3.2
2.2.0 2.11.0
2.1.0 2.10.0
2.0.0 2.7.0
1.1.0-SNAPSHOT - 1.5.12 Matches CQL Translation Service version
1.0.2 1.0.0

Translator Endpoint

The /cql/translator endpoint handles translating CQL to ELM JSON and/or XML.

Simple Translator Request

Example usage via HTTP request:

POST /cql/translator HTTP/1.1
Content-Type: application/cql
Accept: application/elm+json
Host: localhost:8080
Connection: close
Content-Length: 610

library CMS146 version '2'

using QUICK

valueset "Acute Pharyngitis": '2.16.840.1.113883.3.464.1003.102.12.1011'
...

Will return:

HTTP/1.1 200 OK
Content-Type: application/elm+json
Date: Wed, 10 Feb 2016 22:15:33 GMT
Connection: close
Content-Length: 6932

{
  "library": {
    "identifier": {
      "id": "CMS146",
      "version": "2"
    },
    "usings": {"def": [
      {
        "localIdentifier": "System",
        "uri": "urn:hl7-org:elm-types:r1"
      },
      {
        "localId": "1",
        "localIdentifier": "QUICK",
        "uri": "http://hl7.org/fhir"
      }
    ]},
    "valueSets": {"def": [{
      "localId": "2",
      "name": "Acute Pharyngitis",
      "id": "2.16.840.1.113883.3.464.1003.102.12.1011",
      "accessLevel": "Public"
    },...]},
    ...
  }
}

Multipart Translator Request

The service also supports POST of multiple CQL libraries packaged as multipart/form-data. The result will be a similar package with one ELM part for each CQL part in the submitted package.

Example usage via HTTP request:

POST /cql/translator HTTP/1.1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
Accept: multipart/form-data
Host: localhost:8080
content-length: 545
Connection: keep-alive

------WebKitFormBoundary7MA4YWxkTrZu0gW--,
Content-Disposition: form-data; name="HelloWorld"

library HelloWorld version '1.0.0'

using QDM

include Speaker version '1.0.0' called Speaker

define Hello: 'World'

define SpeakerName: Speaker.Name
------WebKitFormBoundary7MA4YWxkTrZu0gW--
Content-Disposition: form-data; name="Speaker"

library Speaker version '1.0.0'

using QDM

define Name: 'Bob'
------WebKitFormBoundary7MA4YWxkTrZu0gW--

Will return:

HTTP/1.1 200
status: 200
MIME-Version: 1.0
Content-Type: multipart/form-data;boundary=Boundary_2_526521536_1556163069788
Date: Thu, 25 Apr 2019 03:47:49 GMT
Content-Length: 2365

--Boundary_2_526521536_1556163069788
Content-Type: application/elm+json
Content-Disposition: form-data; name="HelloWorld"

{
  "library" : {
      "identifier" : {
        "id" : "HelloWorld",
        "version" : "1.0.0"
      },
      "schemaIdentifier" : {
        "id" : "urn:hl7-org:elm",
        "version" : "r1"
      },
      ...
  }
}
--Boundary_2_526521536_1556163069788
Content-Type: application/elm+json
Content-Disposition: form-data; name="Speaker"

{
  "library" : {
      "identifier" : {
        "id" : "Speaker",
        "version" : "1.0.0"
      },
      "schemaIdentifier" : {
        "id" : "urn:hl7-org:elm",
        "version" : "r1"
      },
      ...
  }
}
--Boundary_2_526521536_1556163069788--

CQL-to-ELM Translator Options

The CQL-to-ELM translator supports many options to control the output. These options can be passed to the service as query parameters when you post CQL to the service (e.g., POST http://localhost:8080/cql/translator?annotations=true&result-types=true). These query parameters are supported for both simple requests and multipart requests. See the table below for the available options:

Option Values Default
date-range-optimization true|false false
annotations true|false false
locators true|false false
result-types true|false false
signatures None|Differing|Overloads|All None
detailed-errors true|false false
disable-list-traversal true|false false
disable-list-demotion true|false false
disable-list-promotion true|false false
enable-interval-demotion true|false false
enable-interval-promotion true|false false
disable-method-invocation true|false false
require-from-keyword true|false false
strict true|false false
debug true|false false
validate-units true|false false

For more information on each of these options, see the CQL-to-ELM Overview.

NOTE:

  • Previous versions of the CQL-to-ELM Translation Service defaulted annotations to true. To align better with the CQL-to-ELM console client, the translation service now defaults annotations to false.
  • Previous versions of the CQL-to-ELM Translation Service allowed list-promotion to be disabled via an extra multipart form field named disablePromotion. This is no longer supported, as it was ambiguous and inconsistent with the CQL-to-ELM console client. The disable-list-promotion query parameter should be used instead.

Formatter Endpoint

The /cql/formatter endpoint handles reformatting CQL for improved consistency and readability.

Simple Formatter Request

Example usage via HTTP request:

POST /cql/formatter HTTP/1.1
Content-Type: application/cql
Accept: application/cql
Host: localhost:8080
Content-Length: 50

library HelloWorld using QDM define Hello: 'World'

Will return:

HTTP/1.1 200 OK
Content-Type: application/cql
Content-Length: 59

library HelloWorld

using QDM

define Hello:
  'World'

Multipart Formatter Request

The service also supports POST of multiple CQL libraries packaged as multipart/form-data. The result will be a similar package with one formatted part for each CQL part in the submitted package.

Example usage via HTTP request:

POST /cql/formatter HTTP/1.1
Host: localhost:8080
Content-Type: multipart/form-data; boundary=X-INSOMNIA-BOUNDARY
Accept: multipart/form-data
Content-Length: 465

--X-INSOMNIA-BOUNDARY
Content-Disposition: form-data; name="Simple.cql"
library "SimpleLibrary" version '0.0.1' using FHIR version '4.0.1'
include "FHIRHelpers" version '4.0.1' called FHIRHelpers
context Patient define "MeaningOfLife": 42
--X-INSOMNIA-BOUNDARY
Content-Disposition: form-data; name="FHIRHelpers.cql"
library FHIRHelpers version '4.0.1' using FHIR version '4.0.1'
context Patient define "IsFakeFHIRHelpers": true
--X-INSOMNIA-BOUNDARY--

Will return:

HTTP/1.1 200 OK
MIME-Version: 1.0
Content-Type: multipart/form-data;boundary=Boundary_2_1638692479_1658770032240
Content-Length: 600

--Boundary_2_1638692479_1658770032240
Content-Type: application/cql
Content-Disposition: form-data; name="FHIRHelpers.cql"

library FHIRHelpers version '4.0.1'

using FHIR version '4.0.1'

context Patient

define "IsFakeFHIRHelpers":
  true
--Boundary_2_1638692479_1658770032240
Content-Type: application/cql
Content-Disposition: form-data; name="Simple.cql"

library "SimpleLibrary" version '0.0.1'

using FHIR version '4.0.1'

include "FHIRHelpers" version '4.0.1' called FHIRHelpers

context Patient

define "MeaningOfLife":
  42
--Boundary_2_1638692479_1658770032240--

Docker Deployment

You may deploy pre-built Docker images into your existing hosting environment with:

docker run -d -p 8080:8080 --restart unless-stopped cqframework/cql-translation-service:latest # or any official tag

And you're done. No environment variables or further configuration are needed. Jedis may use your existing Kubernetes, Open Shift etc installations as you see fit. :)

To build your own image for your current architecture:

docker build -t cqframework/cql-translation-service:latest . # but use your your own repo and tag strings!

To build your own image for multiple architectures (e.g., Intel and Mac M1):

docker buildx build --platform linux/amd64,linux/arm64 -t cqframework/cql-translation-service:latest . # but use your your own repo and tag strings!

Note that Docker doesn't support loading multi-platform builds locally, so the above multi-platform build commmand is only helpful when used with --push. See: docker/buildx#59.

Environment Variables

CQL_TRANSLATOR_PORT - Allows you to set the port on which the translation service runs, default value is 8080

License

Copyright 2016-2023 The MITRE Corporation

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.