This page is part of the CDA: Clinical Document Architecture (v2.1.0-draft1: CDA 2.1 Draft) based on FHIR v5.0.0. .  For a full list of available versions, see the Directory of published versions 
| Active as of 2023-01-16 | 
Definitions for the BL logical model.
Guidance on how to interpret the contents of this table can be found here.
| 1. BL | |
| Definition | The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL. | 
| Control | 1..* | 
| XML Representation | In the XML format, this property has the namespace urn:hl7-org:v3. | 
| 2. BL.value | |
| Definition | The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL. | 
| Control | 0..1 | 
| Type | boolean | 
| XML Representation | In the XML format, this property is represented as an attribute. | 
Guidance on how to interpret the contents of this table can be found here.
| 1. BL | |
| Definition | The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL. Base definition for all types defined in FHIR type system. | 
| Control | 10..* | 
| XML Representation | In the XML format, this property has the namespace urn:hl7-org:v3. | 
| Invariants | Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count())) | 
| 2. BL.value | |
| Definition | The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL. | 
| Control | 0..1 | 
| Type | boolean | 
| XML Representation | In the XML format, this property is represented as an attribute. | 
Guidance on how to interpret the contents of this table can be found here.
| 1. BL | |
| Definition | The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL. | 
| Control | 1..* | 
| XML Representation | In the XML format, this property has the namespace urn:hl7-org:v3. | 
| 2. BL.nullFlavor | |
| Definition | If a value is an exceptional value (NULL-value), this specifies in what way and why proper information is missing. | 
| Control | 0..1 | 
| Binding | The codes SHALL be taken from NullFlavor | 
| Type | code | 
| XML Representation | In the XML format, this property is represented as an attribute. | 
| 3. BL.value | |
| Definition | The Boolean type stands for the values of two-valued logic. A Boolean value can be either true or false, or, as any other value may be NULL. | 
| Control | 0..1 | 
| Type | boolean | 
| XML Representation | In the XML format, this property is represented as an attribute. |