# description
A supported modifier for a search parameter.

# concept[].definition
The search parameter returns resources that have a value or not.

# concept[].definition
The search parameter returns resources that have a value that exactly matches the supplied parameter (the whole string, including casing and accents).

# concept[].definition
The search parameter returns resources that include the supplied parameter value anywhere within the field being searched.

# concept[].definition
The search parameter returns resources that do not contain a match.

# concept[].definition
The search parameter is processed as a string that searches text associated with the code/value - either CodeableConcept.text, Coding.display, or Identifier.type.text.

# concept[].definition
The search parameter is a URI (relative or absolute) that identifies a value set, and the search parameter tests whether the coding is in the specified value set.

# concept[].definition
The search parameter is a URI (relative or absolute) that identifies a value set, and the search parameter tests whether the coding is not in the specified value set.

# concept[].definition
The search parameter tests whether the value in a resource is subsumed by the specified value (is-a, or hierarchical relationships).

# concept[].definition
The search parameter tests whether the value in a resource subsumes the specified value (is-a, or hierarchical relationships).

# concept[].definition
The search parameter only applies to the Resource Type specified as a modifier (e.g. the modifier is not actually :type, but :Patient etc.).

# concept[].definition
The search parameter applies to the identifier on the resource, not the reference.

# concept[].definition
The search parameter has the format system|code|value, where the system and code refer to an Identifier.type.coding.system and .code, and match if any of the type codes match. All 3 parts must be present.