From clause

Functional

The `from clause takes all resources from a data-source as input. It produces a subset of those resources by filtering them on resource type. The functional shape of this clause is:

    list-of-node -> from  -> list-of-node

Syntax

from-clause:  'from' resourcetype
resourcetype:  known-fhir-resource | 'Resource'

Optional

A from clause is optional. If a data source is accessed without a from clause, the next clause in the pipeline, will take the full data set as input.

using 'hl7.fhir.r4.core'