MII IG Meta v2025

MII PR Meta SearchParameter

Das Profil legt die Mindestanforderungen fest, die SearchParameter-Ressourcen im Kerndatensatz erfüllen müssen.

Name	Status	Version	Lizenz	Canonical	Basis
MII_PR_Meta_SearchParameter	active	2025.0.0	CC-BY-4.0	https://www.medizininformatik-initiative.de/fhir/modul-meta/StructureDefinition/mii-pr-meta-searchparameter	http://hl7.org/fhir/StructureDefinition/SearchParameter

Folgende Invariante MUSS bei der Erstellung von Custom SearchParameter-Ressourcen berücksichtigt werden.

key	severity	human	expression
search-param-code-regex	error	In SearchParameter.code DÜRFEN NICHT folgende Zeichen enthalten sein: Leerzeichen, `.`, `$`, `\|`.	matches('[^\\s.$\|]+')

Inhalt

MII_PR_Meta_SearchParameter (SearchParameter)	I		SearchParameter	There are no (further) constraints on this element Element id SearchParameter Short description Search parameter for a resource Definition A search parameter that defines a named search item that can be used to search/filter on a resource. Comments In FHIR, search is not performed directly on a resource (by XML or JSON path), but on a named parameter that maps into the resource content. Data type SearchParameter Constraints dom-2: If the resource is contained in another resource, it SHALL NOT contain nested Resources `contained.contained.empty()` dom-4: If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated `contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()` dom-3: If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource `contained.where((('#'+id in (%resource.descendants().reference \| %resource.descendants().as(canonical) \| %resource.descendants().as(uri) \| %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()` dom-6: A resource should have narrative for robust management text.`div`.exists() dom-5: If a resource is contained in another resource, it SHALL NOT have a security label `contained.meta.security.empty()` spd-0: Name should be usable as an identifier for the module by machine processing applications such as code generation `name.matches('[A-Z]([A-Za-z0-9_]){0,254}')` spd-1: If an xpath is present, there SHALL be an xpathUsage `xpath.empty() or xpathUsage.exists()` spd-2: Search parameters can only have chain names when the search parameter type is 'reference' `chain.empty() or type = 'reference'` Mappings rim: Entity. Role, or Act v2: n/a rim: n/a
id	Σ	0..1	string	There are no (further) constraints on this element Element id SearchParameter.id Short description Logical id of this artifact Definition The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes. Comments The only time that a resource does not have an id is when it is being submitted to the server using a create operation. Data type string
meta	Σ	0..1	Meta	There are no (further) constraints on this element Element id SearchParameter.meta Short description Metadata about the resource Definition The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource. Data type Meta Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: N/A
implicitRules	Σ ?!	0..1	uri	There are no (further) constraints on this element Element id SearchParameter.implicitRules Short description A set of rules under which this content was created Definition A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc. Comments Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc. Data type uri Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
language		0..1	codeBinding	There are no (further) constraints on this element Element id SearchParameter.language Short description Language of the resource content Definition The base language in which the resource is written. Comments Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource. Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute). Data type code Binding A human language. CommonLanguages (preferred) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
text		0..1	Narrative	There are no (further) constraints on this element Element id SearchParameter.text Short description Text summary of the resource, for human interpretation Alternate names narrative, html, xhtml, display Definition A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety. Comments Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied). This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded information is added later. Data type Narrative Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a rim: N/A rim: Act.text?
contained		0..*	Resource	There are no (further) constraints on this element Element id SearchParameter.contained Short description Contained, inline Resources Alternate names inline resources, anonymous resources, contained resources Definition These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope. Comments This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again. Contained resources may have profiles and tags In their meta elements, but SHALL NOT have security labels. Data type Resource Mappings rim: Entity. Role, or Act rim: N/A
extension	I	0..*	Extension	There are no (further) constraints on this element Element id SearchParameter.extension Short description Additional content defined by implementations Alternate names extensions, user content Definition May be used to represent additional information that is not part of the basic definition of the resource. 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 can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. 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. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
modifierExtension	?! I	0..*	Extension	There are no (further) constraints on this element Element id SearchParameter.modifierExtension Short description Extensions that cannot be ignored Alternate names extensions, user content Definition May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. 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. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). Requirements Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions. 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. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
url	Σ	1..1	uri	There are no (further) constraints on this element Element id SearchParameter.url Short description Canonical identifier for this search parameter, represented as a URI (globally unique) Definition An absolute URI that is used to identify this search parameter when it is referenced in a specification, model, design or an instance; also called its canonical identifier. This SHOULD be globally unique and SHOULD be a literal address at which at which an authoritative instance of this search parameter is (or will be) published. This URL can be the target of a canonical reference. It SHALL remain the same when the search parameter is stored on different servers. Requirements Allows the search parameter to be referenced by a single globally unique identifier. To allow referencing and reusing search parameter definitions under other names on operational systems (in case of name clash). Comments Can be a urn:uuid: or a urn:oid: but real http: addresses are preferred. Multiple instances may share the same URL if they have a distinct version. The determination of when to create a new version of a resource (same url, new version) vs. defining a new artifact is up to the author. Considerations for making this decision are found in Technical and Business Versions. In some cases, the resource can no longer be found at the stated url, but the url itself cannot change. Implementations can use the meta.source element to indicate where the current master source of the resource can be found. Data type uri Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.url w5: FiveWs.identifier
version	Σ	1..1	string	There are no (further) constraints on this element Element id SearchParameter.version Short description Business version of the search parameter Definition The identifier that is used to identify this version of the search parameter when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the search parameter author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions can be placed in a lexicographical sequence. Comments There may be different search parameter instances that have the same identifier but different versions. The version can be appended to the url in a reference to allow a reference to a particular business version of the search parameter with the format [url]\|[version]. Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.version w5: FiveWs.version
name	Σ I	1..1	string	There are no (further) constraints on this element Element id SearchParameter.name Short description Name for this search parameter (computer friendly) Definition A natural language name identifying the search parameter. This name should be usable as an identifier for the module by machine processing applications such as code generation. Requirements Support human navigation and code generation. Comments The name is not expected to be globally unique. The name should be a simple alphanumeric type name to ensure that it is machine-processing friendly. Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
derivedFrom		0..1	canonical(SearchParameter)	There are no (further) constraints on this element Element id SearchParameter.derivedFrom Short description Original definition for the search parameter Definition Where this search parameter is originally defined. If a derivedFrom is provided, then the details in the search parameter must be consistent with the definition from which it is defined. i.e. the parameter should have the same meaning, and (usually) the functionality should be a proper subset of the underlying search parameter. Comments The intent of this is that a server can designate that it provides support for a search parameter defined in the specification itself (e.g. `value-quantity`, but detail how it is supported by the server. Data type canonical(SearchParameter) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
status	Σ ?!	1..1	codeBinding	There are no (further) constraints on this element Element id SearchParameter.status Short description draft \| active \| retired \| unknown Definition The status of this search parameter. Enables tracking the life-cycle of the content. Comments Allows filtering of search parameters that are appropriate for use versus not. Data type code Binding The lifecycle status of an artifact. PublicationStatus (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.status w5: FiveWs.status
experimental	Σ	1..1	boolean	There are no (further) constraints on this element Element id SearchParameter.experimental Short description For testing purposes, not real usage Definition A Boolean value to indicate that this search parameter is authored for testing purposes (or education/evaluation/marketing) and is not intended to be used for genuine usage. Requirements Enables experimental content to be developed following the same lifecycle that would be used for a production-level search parameter. Comments Allows filtering of search parameters that are appropriate for use versus not. Data type boolean Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.experimental w5: FiveWs.class
date	Σ	1..1	dateTime	There are no (further) constraints on this element Element id SearchParameter.date Short description Date last changed Alternate names Revision Date Definition The date (and optionally time) when the search parameter was published. The date must change when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the search parameter changes. Comments Note that this is not the same as the resource last-modified-date, since the resource may be a secondary representation of the search parameter. Additional specific dates may be added as extensions or be found by consulting Provenances associated with past versions of the resource. Data type dateTime Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.date w5: FiveWs.recorded
publisher	Σ	1..1	string	There are no (further) constraints on this element Element id SearchParameter.publisher Short description Name of the publisher (organization or individual) Definition The name of the organization or individual that published the search parameter. Requirements Helps establish the "authority/credibility" of the search parameter. May also allow for contact. Comments Usually an organization but may be an individual. The publisher (or steward) of the search parameter is the organization or individual primarily responsible for the maintenance and upkeep of the search parameter. This is not necessarily the same individual or organization that developed and initially authored the content. The publisher is the primary point of contact for questions or issues with the search parameter. This item SHOULD be populated unless the information is available from context. Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.publisher w5: FiveWs.witness
contact	Σ	1..*	ContactDetail	There are no (further) constraints on this element Element id SearchParameter.contact Short description Contact details for the publisher Definition Contact details to assist a user in finding and communicating with the publisher. Comments May be a web site, an email address, a telephone number, etc. Data type ContactDetail Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.contact
description	Σ	1..1	markdown	There are no (further) constraints on this element Element id SearchParameter.description Short description Natural language description of the search parameter Definition And how it used. Comments This description can be used to capture details such as why the search parameter was built, comments about misuse, instructions for clinical use and interpretation, literature references, examples from the paper world, etc. It is not a rendering of the search parameter as conveyed in the 'text' field of the resource itself. This item SHOULD be populated unless the information is available from context (e.g. the language of the search parameter is presumed to be the predominant language in the place the search parameter was created). Data type markdown Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.description
useContext	Σ	0..*	UsageContext	There are no (further) constraints on this element Element id SearchParameter.useContext Short description The context that the content is intended to support Definition The content was developed with a focus and intent of supporting the contexts that are listed. These contexts may be general categories (gender, age, ...) or may be references to specific programs (insurance plans, studies, ...) and may be used to assist with indexing and searching for appropriate search parameter instances. Requirements Assist in searching for appropriate content. Comments When multiple useContexts are specified, there is no expectation that all or any of the contexts apply. Data type UsageContext Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.useContext
jurisdiction	Σ	0..*	CodeableConceptBinding	There are no (further) constraints on this element Element id SearchParameter.jurisdiction Short description Intended jurisdiction for search parameter (if applicable) Definition A legal or geographic region in which the search parameter is intended to be used. Comments It may be possible for the search parameter to be used in jurisdictions other than those for which it was originally designed or intended. Data type CodeableConcept Binding Countries and regions within which this artifact is targeted for use. Jurisdiction ValueSet (extensible) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a v2: CE/CNE/CWE rim: CD orim: fhir:CodeableConcept rdfs:subClassOf dt:CD workflow: Definition.jurisdiction
purpose		0..1	markdown	There are no (further) constraints on this element Element id SearchParameter.purpose Short description Why this search parameter is defined Definition Explanation of why this search parameter is needed and why it has been designed as it has. Comments This element does not describe the usage of the search parameter. Instead, it provides traceability of ''why'' the resource is either needed or ''why'' it is defined as it is. This may be used to point to source materials or specifications that drove the structure of this search parameter. Data type markdown Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a workflow: Definition.purpose w5: FiveWs.why[x] objimpl: no-gen-base
code	Σ I	1..1	code	Element id SearchParameter.code Short description Code used in URL Definition The code used in the URL or the parameter name in a parameters resource for this search parameter. Comments For maximum compatibility, use only lowercase ASCII characters. Data type code Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` search-param-code-regex: In SearchParameter.code DÜRFEN NICHT folgende Zeichen enthalten sein: Leerzeichen, `.`, `$`, `\|`. `matches('[^\\s.$\|]+')` Mappings rim: n/a
base	Σ	1..*	codeBinding	There are no (further) constraints on this element Element id SearchParameter.base Short description The resource type(s) this search parameter applies to Definition The base resource type(s) that this search parameter can be used against. Comments A search parameter must always apply to at least one resource type. When search parameters apply to more than one resource type, they can be used against any of the listed resource types, or in a cross-type search (see Cross Resource Search). Data type code Binding One of the resource types defined as part of this version of FHIR. ResourceType (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
type	Σ	1..1	codeBinding	There are no (further) constraints on this element Element id SearchParameter.type Short description number \| date \| string \| token \| reference \| composite \| quantity \| uri \| special Definition The type of value that a search parameter may contain, and how the content is interpreted. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type code Binding Data types allowed to be used for search parameters. SearchParamType (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
expression	I	0..1	string	There are no (further) constraints on this element Element id SearchParameter.expression Short description FHIRPath expression that extracts the values Definition A FHIRPath expression that returns a set of elements for the search parameter. Comments Note that the elements returned by the expression are sometimes complex elements where logic is required to determine quite how to handle them; e.g. CodeableConcepts may contain text and/or multiple codings, where the codings themselves contain a code and a system. For composite search parameters, the outcome of the expression must a collection of base elements from which the composites are derived. Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
xpath	I	0..1	string	There are no (further) constraints on this element Element id SearchParameter.xpath Short description XPath that extracts the values Definition An XPath expression that returns a set of elements for the search parameter. Comments Note that the elements returned by the XPath are sometimes complex elements where logic is required to determine quite how to handle them; e.g. CodeableConcepts may contain text and/or multiple codings, where the codings themselves contain a code and a system. Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
xpathUsage	I	0..1	codeBinding	There are no (further) constraints on this element Element id SearchParameter.xpathUsage Short description normal \| phonetic \| nearby \| distance \| other Definition How the search parameter relates to the set of elements returned by evaluating the xpath query. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type code Binding How a search parameter relates to the set of elements returned by evaluating its xpath query. XPathUsageType (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
target		0..*	codeBinding	There are no (further) constraints on this element Element id SearchParameter.target Short description Types of resource (if a resource reference) Definition Types of resource (if a resource is referenced). Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type code Binding One of the resource types defined as part of this version of FHIR. ResourceType (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
multipleOr		0..1	boolean	There are no (further) constraints on this element Element id SearchParameter.multipleOr Short description Allow multiple values per parameter (or) Definition Whether multiple values are allowed for each time the parameter exists. Values are separated by commas, and the parameter matches if any of the values match. Data type boolean Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
multipleAnd		0..1	boolean	There are no (further) constraints on this element Element id SearchParameter.multipleAnd Short description Allow multiple parameters (and) Definition Whether multiple parameters are allowed - e.g. more than one parameter with the same name. The search matches if all the parameters match. Data type boolean Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
comparator		0..*	codeBinding	There are no (further) constraints on this element Element id SearchParameter.comparator Short description eq \| ne \| gt \| lt \| ge \| le \| sa \| eb \| ap Definition Comparators supported for the search parameter. Comments If no comparators are listed, clients should not expect servers to support any comparators. Data type code Binding What Search Comparator Codes are supported in search. SearchComparator (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
modifier		0..*	codeBinding	There are no (further) constraints on this element Element id SearchParameter.modifier Short description missing \| exact \| contains \| not \| text \| in \| not-in \| below \| above \| type \| identifier \| ofType Definition A modifier supported for the search parameter. Comments Note that FHIR strings SHALL NOT exceed 1MB in size Data type code Binding A supported modifier for a search parameter. SearchModifierCode (required) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
chain		0..*	string	There are no (further) constraints on this element Element id SearchParameter.chain Short description Chained names supported Definition Contains the names of any search parameters which may be chained to the containing search parameter. Chained parameters may be added to search parameters of type reference and specify that resources will only be returned if they contain a reference to a resource which matches the chained parameter value. Values for this field should be drawn from SearchParameter.code for a parameter on the target resource type. Comments Systems are not required to list all the chain names they support, but if they don't list them, clients might not know to use them. Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
component		0..*	BackboneElement	There are no (further) constraints on this element Element id SearchParameter.component Short description For Composite resources to define the parts Definition Used to define the parts of a composite search parameter. Data type BackboneElement Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
id		0..1	string	There are no (further) constraints on this element Element id SearchParameter.component.id Short description Unique id for inter-element referencing Definition Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces. Data type string Mappings rim: n/a
extension	I	0..*	Extension	There are no (further) constraints on this element Element id SearchParameter.component.extension Short description Additional content defined by implementations Alternate names extensions, user content Definition May be used to represent additional information that is not part of the basic definition of the element. 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 can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. 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. Data type Extension Sliced: Unordered, Open, by url(Value) Extensions are always sliced by (at least) url Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
modifierExtension	Σ ?! I	0..*	Extension	There are no (further) constraints on this element Element id SearchParameter.component.modifierExtension Short description Extensions that cannot be ignored even if unrecognized Alternate names extensions, user content, modifiers Definition May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. 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 can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions. Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). Requirements Modifier extensions allow for extensions that cannot be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored. This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the definition of modifier extensions. 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. Data type Extension Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` ext-1: Must have either extensions or value[x], not both `extension.exists() != value.exists()` Mappings rim: n/a rim: N/A
definition		1..1	canonical(SearchParameter)	There are no (further) constraints on this element Element id SearchParameter.component.definition Short description Defines how the part works Definition The definition of the search parameter that describes this part. Comments see Canonical References Data type canonical(SearchParameter) Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a
expression		1..1	string	There are no (further) constraints on this element Element id SearchParameter.component.expression Short description Subexpression relative to main expression Definition A sub-expression that defines how to extract values for this component from the output of the main SearchParameter.expression. Comments This expression overrides the expression in the definition and extracts the index values from the outcome of the composite expression. Data type string Constraints ele-1: All FHIR elements must have a @value or children `hasValue() or (children().count() > id.count())` Mappings rim: n/a

Das Profil legt die Mindestanforderungen fest, die SearchParameter-Ressourcen im Kerndatensatz erfüllen müssen.

<StructureDefinition xmlns="http://hl7.org/fhir">
    <id value="mii-pr-meta-searchparameter" />
    <extension url="https://www.medizininformatik-initiative.de/fhir/modul-meta/StructureDefinition/mii-ex-meta-license-codeable">
        <valueCodeableConcept>
            <coding>
                <system value="http://hl7.org/fhir/spdx-license" />
                <code value="CC-BY-4.0" />
                <display value="Creative Commons Attribution 4.0 International" />
            </coding>
        </valueCodeableConcept>
    </extension>
    <url value="https://www.medizininformatik-initiative.de/fhir/modul-meta/StructureDefinition/mii-pr-meta-searchparameter" />
    <version value="2025.0.0" />
    <name value="MII_PR_Meta_SearchParameter" />
    <title value="MII PR Meta SearchParameter" />
    <status value="active" />
    <experimental value="true" />
    <date value="2024-07-01" />
    <publisher value="Medizininformatik Initiative" />
    <contact>
        <telecom>
            <system value="url" />
            <value value="https://www.medizininformatik-initiative.de" />
        </telecom>
    </contact>
    <description value="Das Profil legt die Mindestanforderungen fest, die SearchParameter-Ressourcen im Kerndatensatz erf&#252;llen m&#252;ssen." />
    <fhirVersion value="4.0.1" />
    <kind value="resource" />
    <abstract value="false" />
    <type value="SearchParameter" />
    <baseDefinition value="http://hl7.org/fhir/StructureDefinition/SearchParameter" />
    <derivation value="constraint" />
    <differential>
        <element id="SearchParameter.version">
            <path value="SearchParameter.version" />
            <min value="1" />
        </element>
        <element id="SearchParameter.experimental">
            <path value="SearchParameter.experimental" />
            <min value="1" />
        </element>
        <element id="SearchParameter.date">
            <path value="SearchParameter.date" />
            <min value="1" />
        </element>
        <element id="SearchParameter.publisher">
            <path value="SearchParameter.publisher" />
            <min value="1" />
        </element>
        <element id="SearchParameter.contact">
            <path value="SearchParameter.contact" />
            <min value="1" />
        </element>
        <element id="SearchParameter.code">
            <path value="SearchParameter.code" />
            <constraint>
                <key value="search-param-code-regex" />
                <severity value="error" />
                <human value="In SearchParameter.code D&#220;RFEN NICHT folgende Zeichen enthalten sein: Leerzeichen, `.`, `$`, `|`." />
                <expression value="matches(&#39;[^\\s.$|]+&#39;)" />
                <source value="https://www.medizininformatik-initiative.de/fhir/modul-meta/StructureDefinition/mii-pr-meta-searchparameter" />
            </constraint>
        </element>
    </differential>
</StructureDefinition>

{
    "resourceType": "StructureDefinition",
    "id": "mii-pr-meta-searchparameter",
    "extension":  [
        {
            "url": "https://www.medizininformatik-initiative.de/fhir/modul-meta/StructureDefinition/mii-ex-meta-license-codeable",
            "valueCodeableConcept": {
                "coding":  [
                    {
                        "code": "CC-BY-4.0",
                        "system": "http://hl7.org/fhir/spdx-license",
                        "display": "Creative Commons Attribution 4.0 International"
                    }
                ]
            }
        }
    ],
    "url": "https://www.medizininformatik-initiative.de/fhir/modul-meta/StructureDefinition/mii-pr-meta-searchparameter",
    "version": "2025.0.0",
    "name": "MII_PR_Meta_SearchParameter",
    "title": "MII PR Meta SearchParameter",
    "status": "active",
    "experimental": true,
    "date": "2024-07-01",
    "publisher": "Medizininformatik Initiative",
    "contact":  [
        {
            "telecom":  [
                {
                    "system": "url",
                    "value": "https://www.medizininformatik-initiative.de"
                }
            ]
        }
    ],
    "description": "Das Profil legt die Mindestanforderungen fest, die SearchParameter-Ressourcen im Kerndatensatz erfüllen müssen.",
    "fhirVersion": "4.0.1",
    "kind": "resource",
    "abstract": false,
    "type": "SearchParameter",
    "baseDefinition": "http://hl7.org/fhir/StructureDefinition/SearchParameter",
    "derivation": "constraint",
    "differential": {
        "element":  [
            {
                "id": "SearchParameter.version",
                "path": "SearchParameter.version",
                "min": 1
            },
            {
                "id": "SearchParameter.experimental",
                "path": "SearchParameter.experimental",
                "min": 1
            },
            {
                "id": "SearchParameter.date",
                "path": "SearchParameter.date",
                "min": 1
            },
            {
                "id": "SearchParameter.publisher",
                "path": "SearchParameter.publisher",
                "min": 1
            },
            {
                "id": "SearchParameter.contact",
                "path": "SearchParameter.contact",
                "min": 1
            },
            {
                "id": "SearchParameter.code",
                "path": "SearchParameter.code",
                "constraint":  [
                    {
                        "key": "search-param-code-regex",
                        "severity": "error",
                        "human": "In SearchParameter.code DÜRFEN NICHT folgende Zeichen enthalten sein: Leerzeichen, `.`, `$`, `|`.",
                        "expression": "matches('[^\\\\s.$|]+')",
                        "source": "https://www.medizininformatik-initiative.de/fhir/modul-meta/StructureDefinition/mii-pr-meta-searchparameter"
                    }
                ]
            }
        ]
    }
}

MII PR Meta SearchParameter