Extensions for Using Data Elements from FHIR R4B in FHIR STU3 - Downloaded Version null See the Directory of published versions
| Page standards status: Trial-use | Maturity Level: 0 |
Definitions for the ext-R4B-InsurancePlan.contact extension.
Guidance on how to interpret the contents of this table can be foundhere
| 0. Extension | |
| Definition | R4B: Optional Extension Element - found in all resources. |
| Short | R4B: Contact for the product (new)Optional Extensions Element |
| Comments | Element |
| Control | 0..* This element is affected by the following invariants: ele-1 |
| Is Modifier | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))ext-1: Must have either extensions or value[x], not both ( extension.exists() != value.exists())ele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (extension.exists() != value.exists()) |
| 2. Extension.extension | |
| Definition | An Extension May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| Short | ExtensionAdditional Content defined by implementations |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Alternate Names | extensions, user content |
| Slicing | This element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 4. Extension.extension:purpose | |
| Slice Name | purpose |
| Definition | R4B: |
| Short | R4B: The type of contact (new)Additional Content defined by implementations |
| Comments | Element |
| Control | 0..1* |
| Type | Extension |
| Requirements | Need to distinguish between multiple contact persons. Element |
| 6. Extension.extension:purpose.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | purpose |
| 8. Extension.extension:purpose.value[x] | |
| Definition | Indicates a purpose for which the contact can be reached. Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list). |
| Short | The type of contactValue of extension |
| Control | 0..1 |
| Binding | Unless not suitable, these codes SHALL be taken from For codes, see ContactEntityType (extensible to http://hl7.org/fhir/ValueSet/contactentity-type|3.0.2)The purpose for which you would contact a contact party. |
| Type | CodeableConcept, date, dateTime, Meta, code, string, Address, Attachment, integer, oid, Count, instant, ContactPoint, HumanName, Money, Identifier, Coding, markdown, SampledData, Ratio, id, positiveInt, Age, Distance, Reference, Period, Quantity, Duration, Range, uri, Annotation, boolean, base64Binary, Signature, unsignedInt, time, Timing, decimal |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 10. Extension.extension:name | |
| Slice Name | name |
| Definition | R4B: |
| Short | R4B: A name associated with the contact (new)Additional Content defined by implementations |
| Comments | Element |
| Control | 0..1* |
| Type | Extension |
| Requirements | Need to be able to track the person by name. Element |
| 12. Extension.extension:name.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | name |
| 14. Extension.extension:name.value[x] | |
| Definition | A name associated with the contact. Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list). |
| Short | A name associated with the contactValue of extension |
| Control | 0..1 |
| Type | HumanName, date, dateTime, Meta, code, string, Address, Attachment, integer, oid, Count, instant, ContactPoint, Money, Identifier, Coding, markdown, SampledData, Ratio, id, positiveInt, Age, Distance, Reference, Period, Quantity, Duration, Range, uri, Annotation, boolean, base64Binary, Signature, unsignedInt, time, Timing, decimal, CodeableConcept |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 16. Extension.extension:telecom | |
| Slice Name | telecom |
| Definition | R4B: |
| Short | R4B: Contact details (telephone, email, etc.) for a contact (new)Additional Content defined by implementations |
| Comments | Element |
| Control | 0..* |
| Type | Extension |
| Requirements | People have (primary) ways to contact them in some way such as phone, email. Element |
| 18. Extension.extension:telecom.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | telecom |
| 20. Extension.extension:telecom.value[x] | |
| Definition | A contact detail (e.g. a telephone number or an email address) by which the party may be contacted. Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list). |
| Short | Contact details (telephone, email, etc.) for a contactValue of extension |
| Control | 0..1 |
| Type | ContactPoint, date, dateTime, Meta, code, string, Address, Attachment, integer, oid, Count, instant, HumanName, Money, Identifier, Coding, markdown, SampledData, Ratio, id, positiveInt, Age, Distance, Reference, Period, Quantity, Duration, Range, uri, Annotation, boolean, base64Binary, Signature, unsignedInt, time, Timing, decimal, CodeableConcept |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 22. Extension.extension:address | |
| Slice Name | address |
| Definition | R4B: |
| Short | R4B: Visiting or postal addresses for the contact (new)Additional Content defined by implementations |
| Comments | Element |
| Control | 0..1* |
| Type | Extension |
| Requirements | May need to keep track of a contact party's address for contacting, billing or reporting requirements. Element |
| 24. Extension.extension:address.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | address |
| 26. Extension.extension:address.value[x] | |
| Definition | Visiting or postal addresses for the contact. Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list). |
| Short | Visiting or postal addresses for the contactValue of extension |
| Control | 0..1 |
| Type | Address, date, dateTime, Meta, code, string, Attachment, integer, oid, Count, instant, ContactPoint, HumanName, Money, Identifier, Coding, markdown, SampledData, Ratio, id, positiveInt, Age, Distance, Reference, Period, Quantity, Duration, Range, uri, Annotation, boolean, base64Binary, Signature, unsignedInt, time, Timing, decimal, CodeableConcept |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 28. Extension.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | http://hl7.org/fhir/4.3/StructureDefinition/extension-InsurancePlan.contact |
| 30. Extension.value[x] | |
| Definition | Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list). |
| Short | Value of extension |
| Control | 0..01 |
| Type | Choice of: base64Binary, boolean, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, Meta |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
Guidance on how to interpret the contents of this table can be foundhere
| 0. Extension | |
| Definition | R4B: |
| Short | R4B: Contact for the product (new) |
| Comments | Element |
| Control | 0..* |
| Is Modifier | false |
| 2. Extension.extension | |
| Control | 0..* |
| Slicing | This element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 4. Extension.extension:purpose | |
| Slice Name | purpose |
| Definition | R4B: |
| Short | R4B: The type of contact (new) |
| Comments | Element |
| Control | 0..1 |
| Requirements | Need to distinguish between multiple contact persons. Element |
| 6. Extension.extension:purpose.url | |
| Control | 1..1 |
| Fixed Value | purpose |
| 8. Extension.extension:purpose.value[x] | |
| Definition | Indicates a purpose for which the contact can be reached. |
| Short | The type of contact |
| Control | 0..1 |
| Binding | Unless not suitable, these codes SHALL be taken from ContactEntityType (extensible to http://hl7.org/fhir/ValueSet/contactentity-type|3.0.2)The purpose for which you would contact a contact party. |
| Type | CodeableConcept |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 10. Extension.extension:name | |
| Slice Name | name |
| Definition | R4B: |
| Short | R4B: A name associated with the contact (new) |
| Comments | Element |
| Control | 0..1 |
| Requirements | Need to be able to track the person by name. Element |
| 12. Extension.extension:name.url | |
| Control | 1..1 |
| Fixed Value | name |
| 14. Extension.extension:name.value[x] | |
| Definition | A name associated with the contact. |
| Short | A name associated with the contact |
| Control | 0..1 |
| Type | HumanName |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 16. Extension.extension:telecom | |
| Slice Name | telecom |
| Definition | R4B: |
| Short | R4B: Contact details (telephone, email, etc.) for a contact (new) |
| Comments | Element |
| Control | 0..* |
| Requirements | People have (primary) ways to contact them in some way such as phone, email. Element |
| 18. Extension.extension:telecom.url | |
| Control | 1..1 |
| Fixed Value | telecom |
| 20. Extension.extension:telecom.value[x] | |
| Definition | A contact detail (e.g. a telephone number or an email address) by which the party may be contacted. |
| Short | Contact details (telephone, email, etc.) for a contact |
| Control | 0..1 |
| Type | ContactPoint |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 22. Extension.extension:address | |
| Slice Name | address |
| Definition | R4B: |
| Short | R4B: Visiting or postal addresses for the contact (new) |
| Comments | Element |
| Control | 0..1 |
| Requirements | May need to keep track of a contact party's address for contacting, billing or reporting requirements. Element |
| 24. Extension.extension:address.url | |
| Control | 1..1 |
| Fixed Value | address |
| 26. Extension.extension:address.value[x] | |
| Definition | Visiting or postal addresses for the contact. |
| Short | Visiting or postal addresses for the contact |
| Control | 0..1 |
| Type | Address |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 28. Extension.url | |
| Control | 1..1 |
| Fixed Value | http://hl7.org/fhir/4.3/StructureDefinition/extension-InsurancePlan.contact |
| 30. Extension.value[x] | |
| Control | 0..0 |
Guidance on how to interpret the contents of this table can be foundhere
| 0. Extension | |
| Definition | R4B: |
| Short | R4B: Contact for the product (new) |
| Comments | Element |
| Control | 0..* This element is affected by the following invariants: ele-1 |
| Is Modifier | false |
| Invariants | ele-1: All FHIR elements must have a @value or children (hasValue() | (children().count() > id.count()))ext-1: Must have either extensions or value[x], not both ( extension.exists() != value.exists()) |
| 2. Extension.id | |
| Definition | unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Short | xml:id (or equivalent in JSON) |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| 4. Extension.extension | |
| Definition | An Extension |
| Short | Extension |
| Control | 0..* |
| Type | Extension |
| Slicing | This element introduces a set of slices on Extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 6. Extension.extension:purpose | |
| Slice Name | purpose |
| Definition | R4B: |
| Short | R4B: The type of contact (new) |
| Comments | Element |
| Control | 0..1 |
| Type | Extension |
| Requirements | Need to distinguish between multiple contact persons. Element |
| 8. Extension.extension:purpose.id | |
| Definition | unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Short | xml:id (or equivalent in JSON) |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| 10. Extension.extension:purpose.extension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| Short | Additional Content defined by implementations |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Alternate Names | extensions, user content |
| Slicing | This element introduces a set of slices on Extension.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 12. Extension.extension:purpose.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | purpose |
| 14. Extension.extension:purpose.value[x] | |
| Definition | Indicates a purpose for which the contact can be reached. |
| Short | The type of contact |
| Control | 0..1 |
| Binding | Unless not suitable, these codes SHALL be taken from ContactEntityType (extensible to http://hl7.org/fhir/ValueSet/contactentity-type|3.0.2)The purpose for which you would contact a contact party. |
| Type | CodeableConcept |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 16. Extension.extension:name | |
| Slice Name | name |
| Definition | R4B: |
| Short | R4B: A name associated with the contact (new) |
| Comments | Element |
| Control | 0..1 |
| Type | Extension |
| Requirements | Need to be able to track the person by name. Element |
| 18. Extension.extension:name.id | |
| Definition | unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Short | xml:id (or equivalent in JSON) |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| 20. Extension.extension:name.extension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| Short | Additional Content defined by implementations |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Alternate Names | extensions, user content |
| Slicing | This element introduces a set of slices on Extension.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 22. Extension.extension:name.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | name |
| 24. Extension.extension:name.value[x] | |
| Definition | A name associated with the contact. |
| Short | A name associated with the contact |
| Control | 0..1 |
| Type | HumanName |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 26. Extension.extension:telecom | |
| Slice Name | telecom |
| Definition | R4B: |
| Short | R4B: Contact details (telephone, email, etc.) for a contact (new) |
| Comments | Element |
| Control | 0..* |
| Type | Extension |
| Requirements | People have (primary) ways to contact them in some way such as phone, email. Element |
| 28. Extension.extension:telecom.id | |
| Definition | unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Short | xml:id (or equivalent in JSON) |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| 30. Extension.extension:telecom.extension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| Short | Additional Content defined by implementations |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Alternate Names | extensions, user content |
| Slicing | This element introduces a set of slices on Extension.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 32. Extension.extension:telecom.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | telecom |
| 34. Extension.extension:telecom.value[x] | |
| Definition | A contact detail (e.g. a telephone number or an email address) by which the party may be contacted. |
| Short | Contact details (telephone, email, etc.) for a contact |
| Control | 0..1 |
| Type | ContactPoint |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 36. Extension.extension:address | |
| Slice Name | address |
| Definition | R4B: |
| Short | R4B: Visiting or postal addresses for the contact (new) |
| Comments | Element |
| Control | 0..1 |
| Type | Extension |
| Requirements | May need to keep track of a contact party's address for contacting, billing or reporting requirements. Element |
| 38. Extension.extension:address.id | |
| Definition | unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. |
| Short | xml:id (or equivalent in JSON) |
| Control | 0..1 |
| Type | string |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| 40. Extension.extension:address.extension | |
| Definition | May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| Short | Additional Content defined by implementations |
| Comments | There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone. |
| Control | 0..* |
| Type | Extension |
| Alternate Names | extensions, user content |
| Slicing | This element introduces a set of slices on Extension.extension.extension. The slices areUnordered and Open, and can be differentiated using the following discriminators: |
| 42. Extension.extension:address.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | address |
| 44. Extension.extension:address.value[x] | |
| Definition | Visiting or postal addresses for the contact. |
| Short | Visiting or postal addresses for the contact |
| Control | 0..1 |
| Type | Address |
| [x] Note | SeeChoice of Data Typesfor further information about how to use [x] |
| 46. Extension.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL. |
| Short | identifies the meaning of the extension |
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension. |
| Control | 1..1 |
| Type | uri |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |
| XML Format | In the XML format, this property is represented as an attribute. |
| Fixed Value | http://hl7.org/fhir/4.3/StructureDefinition/extension-InsurancePlan.contact |
| 48. Extension.value[x] | |
| Definition | Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list). |
| Short | Value of extension |
| Control | 0..0 |
| Type | Choice of: base64Binary, boolean, code, date, dateTime, decimal, id, instant, integer, markdown, oid, positiveInt, string, time, unsignedInt, uri, Address, Age, Annotation, Attachment, CodeableConcept, Coding, ContactPoint, Count, Distance, Duration, HumanName, Identifier, Money, Period, Quantity, Range, Ratio, Reference, SampledData, Signature, Timing, Meta |
| Primitive Value | This primitive element may be present, or absent, or replaced by an extension |