This code system http://terminology.hl7.org/CodeSystem/testscript-operation-codes defines the following codes:

Code	Display	Definition
read	Read	Read the current state of the resource.
vread	Version Read	Read the state of a specific version of the resource.
update	Update	Update an existing resource by its id.
updateCreate	Create using Update	Update an existing resource by its id (or create it if it is new).
patch	Patch	Patch an existing resource by its id.
delete	Delete	Delete a resource.
deleteCondSingle	Conditional Delete Single	Conditionally delete a single resource based on search parameters.
deleteCondMultiple	Conditional Delete Multiple	Conditionally delete one or more resources based on search parameters.
history	History	Retrieve the change history for a particular resource or resource type.
create	Create	Create a new resource with a server assigned id.
search	Search	Search based on some filter criteria.
batch	Batch	Update, create or delete a set of resources as independent actions.
transaction	Transaction	Update, create or delete a set of resources as a single transaction.
capabilities	Capabilities	Get a capability statement for the system.
apply	$apply	Realizes an ActivityDefinition in a specific context
closure	$closure	Closure Table Maintenance
find-matches	$find-matches	Finding Codes based on supplied properties
conforms	$conforms	Compare two systems CapabilityStatements
data-requirements	$data-requirements	Aggregates and returns the parameters and data requirements for a resource and all its dependencies as a single module definition
document	$document	Generate a Document
evaluate	$evaluate	Request clinical decision support guidance based on a specific decision support module
evaluate-measure	$evaluate-measure	Invoke an eMeasure and obtain the results
everything	$everything	Return all the related information as described in the Encounter or Patient
expand	$expand	Value Set Expansion
find	$find	Find a functional list
graphql	$graphql	Invoke a GraphQL query
implements	$implements	Test if a server implements a client's required operations
lastn	$lastn	Last N Observations Query
lookup	$lookup	Concept Look Up and Decomposition
match	$match	Find patient matches using MPI based logic
meta	$meta	Access a list of profiles, tags, and security labels
meta-add	$meta-add	Add profiles, tags, and security labels to a resource
meta-delete	$meta-delete	Delete profiles, tags, and security labels for a resource
populate	$populate	Populate Questionnaire
populatehtml	$populatehtml	Generate HTML for Questionnaire
populatelink	$populatelink	Generate a link to a Questionnaire completion webpage
process-message	$process-message	Process a message according to the defined event
questionnaire	$questionnaire	Build Questionnaire
stats	$stats	Observation Statistics
subset	$subset	Fetch a subset of the CapabilityStatement resource
subsumes	$subsumes	CodeSystem Subsumption Testing
transform	$transform	Model Instance Transformation
translate	$translate	Concept Translation
validate	$validate	Validate a resource
validate-code	$validate-code	ValueSet based Validation