{ "id": "snomed-ecl", "url": "/snomed-ecl/", "md_url": "/snomed-ecl.md", "json_url": "/snomed-ecl.json", "claims_url": "/snomed-ecl/beweringen/", "type": { "code": "Specification", "label": "Standaard of specificatie" }, "schema_type": "CreativeWork", "lang": "nl", "translation": null, "title": "SNOMED CT Expression Constraint Language (ECL)", "aliases": [ "ECL", "Expression Constraint Language", "ECL Core", "SNOMED CT ECL" ], "names": { "nl": "SNOMED CT Expression Constraint Language", "fr": null, "en": "SNOMED CT Expression Constraint Language", "de": null }, "jurisdiction": [ { "code": "internationaal", "label": "Internationaal" } ], "themes": [ { "code": "terminologie", "label": "Terminologie en codering" }, { "code": "standaardisatie-en-governance", "label": "Standaardisatie en governance" } ], "lifecycle": { "code": "normatief", "label": "normatief" }, "lifecycle_note_html": "Officiële specificatie; ECL v2.3 is de huidige versie volgens de specificatie van SNOMED International (geraadpleegd 2026-11-05); de verwante querytaal werd niet als officiële specificatie gevonden.", "version": "ECL v2.3", "vendor": null, "sectors": [], "homologations": [], "links": [ { "kind": { "code": "documentatie", "label": "Documentatie" }, "url": "https://docs.snomed.org/snomed-ct-specifications/snomed-ct-expression-constraint-language", "label": "Expression Constraint Language – Specification and Guide", "host": "docs.snomed.org", "lang": "en" } ], "summary_text": "De Expression Constraint Language (ECL) is de formele taal van SNOMED International om een begrensde verzameling SNOMED CT-concepten of -expressies te beschrijven met een regel in plaats van een opsomming. Met ECL beperk je de toegelaten waarden van een veld in een EPD, definieer je een refset of terminologiebinding, of bevraag je SNOMED CT. De huidige versie is ECL v2.3, met een compacte en een lange syntaxis en een lichter profiel ECL Core. Het uitvoeren gebeurt doorgaans op een terminologieserver; in FHIR kan een waardeset met ECL worden gedefinieerd.", "summary_html": "

De Expression Constraint Language (ECL) is de formele taal van SNOMED International om een begrensde verzameling SNOMED CT-concepten of -expressies te beschrijven met een regel in plaats van een opsomming. Met ECL beperk je de toegelaten waarden van een veld in een EPD, definieer je een refset of terminologiebinding, of bevraag je SNOMED CT. De huidige versie is ECL v2.3, met een compacte en een lange syntaxis en een lichter profiel ECL Core. Het uitvoeren gebeurt doorgaans op een terminologieserver; in FHIR kan een waardeset met ECL worden gedefinieerd.

", "last_verified": "2026-11-05", "verification_outdated": false, "sections": [ { "id": "in-het-kort", "title": "In het kort", "kind": "in-het-kort", "html": "" }, { "id": "wat-is-het", "title": "Wat is het?", "kind": "tekst", "html": "

Een expression constraint is een berekenbare regel die een begrensde verzameling klinische betekenissen afbakent, voorgesteld door pre- of postgecoördineerde expressies[1]; wat die expressies zijn, staat op SNOMED CT-conceptmodel en logica. De Expression Constraint Language (ECL) is de taal waarin zo'n regel geschreven wordt[1]. ECL kan de toegelaten waarden van een gegevenselement in een EPD beperken, de definitie van een refset vormen, als query dienen of het bereik van een attribuut in het conceptmodel beperken[1].

\n

Met ECL kan een terminologiebinding (de koppeling tussen een veld in een informatiemodel en de toegelaten codes) intensioneel worden gedefinieerd (met een regel in plaats van een opsomming), zodat de mogelijke waarden in bijvoorbeeld een FHIR-resource of een CDA-template worden beperkt[6]. Op dezelfde manier kan ECL de intensionele definitie van een subset vastleggen, die vervolgens als Simple Reference Set wordt opgesomd[6].

" }, { "id": "hoe-is-het-opgebouwd", "title": "Hoe is het opgebouwd?", "kind": "tekst", "html": "

Versies en beheer

\n

SNOMED International bezit de rechten op SNOMED CT en de verwante terminologiestandaarden[7] (zie SNOMED International). De eerste versie van ECL verscheen in 2014[8]; de huidige versie is ECL v2.3[1]. Volgens de lijst van eerdere versies volgden daartussen onder meer v1.1.1 (2016), v1.3 tot v1.6 (2017-2021), v2.0 (april 2022), v2.1 (augustus 2022) en v2.2 (november 2023)[9].

\n

Syntaxen en profiel

\n

ECL heeft twee gelijkwaardige syntaxen: een compacte brief syntax voor uitwisseling tussen systemen en een long syntax die de symbolen vervangt door woorden[2]. ECL Core is een deelverzameling van ECL die de eisen aan software verlaagt[2].

\n

Familie van SNOMED CT-talen

\n

ECL hoort bij een familie van SNOMED CT-talen; de Compositional Grammar (voor expressies) vormt de gemeenschappelijke basis waarop de andere talen voortbouwen[2]. Sjablonen met invulbare 'slots' (expression templates) zijn een van de sjabloontypes van de Template Syntax Specification[10]. De SNOMED CT Query Language bouwt voort op ECL en voegt specifieke filters toe, bijvoorbeeld op versie en op velden uit de releasebestanden[8]; volgens de Data Analytics Guide waren de sjabloon- en querytalen nog in ontwikkeling[8]. Interpretatie: het overzicht van officiële specificaties noemt de Compositional Grammar, ECL, de Template Syntax en de URI Standard, maar geen Query Language, die dus niet als officiële specificatie gevonden werd[11].

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
TaalWaarvoorStatusBron
Compositional Grammarexpressies noteren; basis voor de andere talenofficiële specificatie[12][2][11]
Expression Constraint Languageverzamelingen concepten of expressies afbakenenofficiële specificatie, v2.3[1][11]
Template Syntaxsjablonen met invulbare slotsofficiële specificatie[10][11]
Query LanguageECL plus filters op versie en releaseveldenniet als officiële specificatie gevonden[8][11]
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Specification and Guide'", "as_of": "2026-11-05", "source": { "id": "SRC-319df1266a", "title": "Expression Constraint Language - Specification and Guide", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-specifications/snomed-ct-expression-constraint-language", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-86a0a995", "statement": "ECL heeft twee gelijkwaardige syntaxen - een compacte 'brief syntax' voor uitwisseling tussen systemen en een 'long syntax' met tekstuele alternatieven voor de symbolen.", "kind": "fact", "kind_label": "feit", "locator": "sectie 'Purpose'", "as_of": "2026-11-05", "source": { "id": "SRC-931ac667f8", "title": "Expression Constraint Language - Introduction", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-specifications/snomed-ct-expression-constraint-language/introduction/1-introduction", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-483dc19b", "statement": "ECL Core is een deelverzameling van ECL die de eisen aan tooling verlaagt.", "kind": "fact", "kind_label": "feit", "locator": "sectie 'Purpose'", "as_of": "2026-11-05", "source": { "id": "SRC-931ac667f8", "title": "Expression Constraint Language - 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General Principles", "publisher": "HL7 International", "url": "https://hl7.org/fhir/uv/ips/en/General-Principles.html", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-f6ac6e16", "statement": "Met ECL kan een terminologiebinding intensioneel worden gedefinieerd, zodat de mogelijke gecodeerde waarden in een informatiemodel (bv. een FHIR-resource of CDA-template) worden beperkt.", "kind": "fact", "kind_label": "feit", "locator": "sectie 'Terminology Binding'", "as_of": "2026-11-05", "source": { "id": "SRC-626df923aa", "title": "Expression Constraint Language - Use Cases", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-specifications/snomed-ct-expression-constraint-language/introduction/2-use-cases", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-e0eec211", "statement": "ECL kan de intensionele definitie van een subset vastleggen die vervolgens als Simple Reference Set wordt opgesomd.", "kind": "fact", "kind_label": "feit", "locator": "sectie 'Intensional Reference Set Definitions'", "as_of": "2026-11-05", "source": { "id": "SRC-626df923aa", "title": "Expression Constraint Language - Use Cases", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-specifications/snomed-ct-expression-constraint-language/introduction/2-use-cases", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-3edb7dff", "statement": "SNOMED International is de not-for-profitorganisatie die SNOMED CT bezit en beheert en de rechten op SNOMED CT en verwante terminologiestandaarden bezit.", "kind": "fact", "kind_label": "feit", "locator": "sectie 'Why is this important?'", "as_of": "2026-11-05", "source": { "id": "SRC-400c6a7454", "title": "SNOMED CT Starter Guide - The Organization Behind SNOMED CT", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-starter-guide/14-the-organization-behind-snomed-ct", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-b251f07f", "statement": "De eerste versie van ECL verscheen in 2014; de template- en querytalen waren volgens de Data Analytics Guide nog in ontwikkeling (datum van die passage niet vermeld).", "kind": "fact", "kind_label": "feit", "locator": "tweede alinea", "as_of": "2026-11-05", "source": { "id": "SRC-bd9b5fe888", "title": "SNOMED CT Data Analytics Guide - SNOMED CT Languages", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-data-analytics-guide/9-database-queries/9.1-terminology-queries/9.1.1-snomed-ct-languages", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-345ac7ee", "statement": "Interpretatie van de lijst eerdere versies: na de eerste specificatie (2015) volgden onder meer v1.1.1 (2016), v1.3 tot v1.6 (2017-2021), v2.0 (april 2022), v2.1 (augustus 2022) en v2.2 (22 november 2023).", "kind": "interpretation", "kind_label": "interpretatie", "locator": "Appendix F, lijst van PDF's", "as_of": "2026-11-05", "source": { "id": "SRC-0e81550ee3", "title": "Expression Constraint Language - Appendix F: Previous Versions", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-specifications/snomed-ct-expression-constraint-language/appendices/appendix-f-previous-versions", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-9a429f45", "statement": "ECL hoort bij een familie van SNOMED CT-talen, naast de Compositional Grammar (voor expressies) en de Template Syntax (sjablonen met invulbare 'slots').", "kind": "fact", "kind_label": "feit", "locator": "sectie 'Scope'", "as_of": "2026-11-05", "source": { "id": "SRC-931ac667f8", "title": "Expression Constraint Language - Introduction", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-specifications/snomed-ct-expression-constraint-language/introduction/1-introduction", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-baad6dfd", "statement": "Expression templates (sjablonen met slots) zijn een van de sjabloontypes van de SNOMED CT Template Syntax Specification.", "kind": "fact", "kind_label": "feit", "locator": "Notes", "as_of": "2026-11-05", "source": { "id": "SRC-f22df45a59", "title": "SNOMED CT Glossary - SNOMED CT expression template", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-international-documents/snomed-ct-glossary/s/snomed-ct-expression-template", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-0f1a3aa0", "statement": "De SNOMED CT Query Language bouwt voort op de functies van ECL en voegt SNOMED CT-specifieke filters toe, bijvoorbeeld op versie en op velden uit de releasebestanden.", "kind": "fact", "kind_label": "feit", "locator": "alinea over de SNOMED CT Query Language", "as_of": "2026-11-05", "source": { "id": "SRC-bd9b5fe888", "title": "SNOMED CT Data Analytics Guide - SNOMED CT Languages", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-data-analytics-guide/9-database-queries/9.1-terminology-queries/9.1.1-snomed-ct-languages", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-1a917ac1", "statement": "Interpretatie: het overzicht van officiële specificaties (raadpleging 2026-11-05) noemt de Compositional Grammar, ECL, de Template Syntax Specification en de URI Standard, maar geen Query Language-specificatie; die querytaal is dus niet als officiële specificatie gepubliceerd gevonden.", "kind": "interpretation", "kind_label": "interpretatie", "locator": "lijst 'Available Specifications'", "as_of": "2026-11-05", "source": { "id": "SRC-1be19174c6", "title": "SNOMED CT Specifications", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-specifications", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-430cf718", "statement": "Expressies worden genoteerd in de SNOMED CT Compositional Grammar, een lichte syntaxis voor SNOMED CT-expressies.", "kind": "fact", "kind_label": "feit", "locator": "sectie 'What is this?'", "as_of": "2026-11-05", "source": { "id": "SRC-87fc14615a", "title": "SNOMED CT Starter Guide - SNOMED CT Expressions", "publisher": "SNOMED International", "url": "https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-starter-guide/7-snomed-ct-expressions", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-40a429f1", "statement": "De impliciete waardeset met URL-patroon ?fhir_vs=ecl/[ecl] bevat alle concept-id's die aan de (URI-gecodeerde) expression constraint voldoen.", "kind": "fact", "kind_label": "feit", "locator": "sectie 'Implicit Value Sets', lijst van query-patronen", "as_of": "2026-11-05", "source": { "id": "SRC-e9e963ce7b", "title": "Using SNOMED CT with HL7 Standards (FHIR R4)", "publisher": "HL7 International", "url": "https://hl7.org/fhir/R4/snomedct.html", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true }, { "id": "CLM-b487356e", "statement": "De browser van de LOINC Ontology heeft een tabblad om ECL-queries op de inhoud uit te voeren.", "kind": "fact", "kind_label": "feit", "locator": "vraag 'How can I browse the LOINC Ontology?'", "as_of": "2026-11-05", "source": { "id": "SRC-425420fa57", "title": "LOINC Ontology - FAQ", "publisher": "Regenstrief Institute (LOINC)", "url": "https://loinc.org/kb/ontology/faq", "published": null }, "citaat": null, "figuur": null, "in_text": true, "on_page": true } ], "diagrams": [], "facets": { "type": [ "Specification" ], "jurisdiction": [ "internationaal" ], "theme": [ "terminologie", "standaardisatie-en-governance" ], "lifecycle": [ "normatief" ], "section": [ "standaarden", "europa" ] }, "search_terms": [ "SNOMED CT Expression Constraint Language (ECL)", "ECL", "Expression Constraint Language", "ECL Core", "SNOMED CT ECL", "SNOMED CT Expression Constraint Language" ], "release_id": "2026.11.12-3", "license": "CC BY 4.0" }