DRS preference in File profile (#60)

* ⚡ added DRS preference to File profile

* ♻️ created DRS Profile and allowed multiple attachments in NCPI File

* 🚧 fine-tuned the slicing rules for files with DRS

input/fsh/modules/files.fsh

@@ -111,6 +111,20 @@ Description: "Provides a list of hashes for confirming file transfers"
 * extension contains HashType named hash-type 1..1
 * extension[hash-type] ^short = "Algorithm used to calculate the hash (and size, where applicable)"
 
+Invariant: must-be-drs-uri
+Description: "attachment.url must start with ^drs://. A drs:// hostname-based URI, as defined in the DRS documentation, that tells clients how to access this object. The intent of this field is to make DRS objects self-contained, and therefore easier for clients to store and pass around.  For example, if you arrive at this DRS JSON by resolving a compact identifier-based DRS URI, the `self_uri` presents you with a hostname and properly encoded DRS ID for use in subsequent `access` endpoint calls."
+Expression: "$this.url.matches('^drs://.*')"
+Severity: #error
+
+Profile: DRSAttachment
+Parent: Attachment
+Id: ncpi-drs-attachment
+Title: "DRS Attachment"
+Description: "A FHIR Attachment with a DRS url."
+* ^version = "0.1.0"
+* ^status = #draft
+* obeys must-be-drs-uri
+
 /** TODO Add Related file to metadata - AH 2024-07-30 */ 
 
 Profile: NcpiFile
@@ -139,4 +153,20 @@ Description: "Information about a file related to a research participant"
 * description ^short = "A description of the file"
 * type 0..1 /*File Type*/
 * type from edam-ontology-terms (extensible) 
-* type ^short = "The type of data contained in this file."
+* type ^short = "The type of data contained in this file."
+
+Profile: NcpiDRSFile
+Parent: NcpiFile
+Id: ncpi-drs-file
+Title: "NCPI DRS File"
+Description: "Information about a DRS file related to a research participant"
+* ^version = "0.0.1"
+* ^status = #draft
+* content ^slicing.discriminator.type = #pattern
+* content ^slicing.discriminator.path = "code"
+* content ^slicing.rules = #openAtEnd
+* content ^slicing.ordered = true
+* content ^slicing.description = "Slicing pattern to make content.attachment require a DRS file type and allow other file types"
+* content contains
+  DRS 1..1 
+* content[DRS].attachment only DRSAttachment