Clinical Quality Language Specification
2.0.0-ballot - R2 STU 1 (Ballot)

Clinical Quality Language Specification, published by Clinical Decision Support WG. This guide is not an authorized publication; it is the continuous build for version 2.0.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/cql/ and changes regularly. See the Directory of published versions

## Table of Contents

0 Table of Contents
1 CQL Specification
1.1 Introduction
1.2 Author's Guide
1.3 Developer's Guide
1.4 Logical Specification
1.5 Language Semantics
1.6 Translation Semantics
1.7 Physical Representation
1.8 Appendix A - CQL Syntax
1.9 Appendix B - CQL Reference
1.10 Appendix C - Reference Implementations
1.11 Appendix D - References
1.12 Appendix E - Acronyms
1.13 Appendix F - Glossary
1.14 Appendix G - Formatting Conventions
1.15 Appendix H - Time Interval Calculations
1.16 Appendix I - FHIRPath Translation
1.17 Appendix J - List Of Tables
1.18 Appendix K - List Of Figures
1.19 Appendix L - CQL Syntax Diagrams
1.20 Appendix M - Messages
2 Title
3 License
4 Executive Summary
5 Grammar
6 ELM
7 Examples
8 Tests
9 Downloads
10 Changes
10.1 V1.1 Change Log
10.2 V1.2 Change Log
10.3 V1.3 Change Log
10.4 V1.4 Change Log
10.5 V1.5 Change Log
10.6 V2.0 Change Log
11 Artifacts Summary
11.1 CQL Capability Characteristic Codes
11.2 CQL Language Capability
11.3 CQL Message Category
11.4 CQL Message Characteristic
11.5 CQL Message Code
11.6 CQL Message Severity
11.7 CQL Message Source
11.8 CQL Capability Characteristic Codes
11.9 CQL Language Capability Codes
11.10 CQL Message Category Codes
11.11 CQL Message Characteristic Codes
11.12 CQL Message Codes
11.13 CQL Message Severity Codes
11.14 CQL Message Source Codes