Struct Invariant 

pub struct Invariant {
    pub key: String,
    pub severity: Severity,
    pub human: String,
    pub expression: String,
    pub xpath: Option<String>,
}

Invariant constraint from FHIR specification

This structure is shared between the validator and code generator. Generated resources embed these as static constants.

Fields

key: String

Invariant key (e.g., “pat-1”, “obs-3”)

severity: Severity

Severity level

human: String

Human-readable description

expression: String

FHIRPath expression to evaluate

xpath: Option<String>

XPath expression (legacy, optional)

Implementations

impl Invariant

pub fn new( key: impl Into<String>, severity: Severity, human: impl Into<String>, expression: impl Into<String>, ) -> Self

Create a new invariant

pub fn with_xpath(self, xpath: impl Into<String>) -> Self

Add XPath expression (legacy support)

Trait Implementations

impl Clone for Invariant

fn clone(&self) -> Invariant

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Invariant

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Invariant

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Invariant

fn eq(&self, other: &Invariant) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Invariant

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Invariant

impl StructuralPartialEq for Invariant