Article Ashok Kumar Thangavel · Feb 24 2m read

In the modern healthcare landscape, finding clinically similar patients often feels like looking for a needle in a haystack. Traditional keyword searches often fail because medical language is highly nuanced; a search for "Heart Failure" might miss a record containing "Congestive Cardiac Failure."

I am excited to share iris-medmatch, an AI-powered patient matching engine built on InterSystems IRIS for Health. By leveraging Vector Search, this tool understands clinical intent rather than just matching literal strings.

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Article Ashok Kumar Thangavel · Feb 20 3m read

This is an excellent candidate for a developer community post (like Dev.to, Medium, or the InterSystems Community). It bridges the gap between high-level architecture and hands-on implementation.

Here is the summarized article format.


Building a Robust Asynchronous Queue Manager with InterSystems IRIS and Angular

As applications scale, handling heavy computational tasks synchronously becomes a bottleneck. Whether it's processing large data sets, sending high-volume emails, or managing API integrations, a decoupled architecture is essential.

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Article Ashok Kumar Thangavel · Jan 14 14m read

What is a FHIR Profile?

A FHIR profile is a collection of rules and constraints used to customize and refine a base Fast Healthcare Interoperability Resources (FHIR) resource. Profiling is a vital process that adapts the base FHIR resource standard to satisfy the unique requirements of a specific use case, geographic region, medical institution, or clinical workflow.

While the base FHIR specification provides generic, flexible definitions for resources (such as Patient, Observation, or Medication), profiles transform these generic resources into more precise ones. This ensures consistent and interoperable data exchange tailored for a particular community or implementation.

FHIR is designed to cover various healthcare scenarios globally. Profiles allow implementers to adapt this general platform without losing the benefits of standardization.

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Article Ashok Kumar Thangavel · Dec 28, 2025 3m read

Embeddedpy-bridge: A Toolkit for Embedded Python

Overview

Embedded Python is a game-changer for InterSystems IRIS, offering access to the vast Python ecosystem directly within the database. However, bridging the gap between ObjectScript and Python can sometimes feel like translating between two different worlds.

To make this transition seamless using embeddedpy-bridge.

This package is a developer-centric utility kit designed to provide high-level ObjectScript wrappers, familiar syntax, and robust error handling for Embedded Python.

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Question Ashok Kumar Thangavel · Dec 15, 2025

Hello Community,

What is the correct way to import and compile .dfi files when using zpm load? Do .dfi files need to be defined in module.xml?

I have code that imports the .dfi file successfully; however, when I run
zpm "load /home/irisowner/dev/ -v"

I get the message: Unknown file type. Skipping file: .pivot.DFI

    zpm "install isc-dev"do

Thank you!

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Article Ashok Kumar Thangavel · Nov 10, 2025 2m read

FastJsonSchema: High-Performance JSON Validation in IRIS

Validating JSON data against JSON Schema is a common requirement for modern applications. FastJsonSchema brings this capability natively to InterSystems IRIS, combining speed, simplicity, and full schema compliance.

Unlike traditional validation approaches, FastJsonSchema generates native ObjectScript code from your JSON Schemas and compiles it directly to iris object code, enabling idiomatic performance without relying on external libraries or runtimes.

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Article Ashok Kumar Thangavel · Nov 4, 2025 3m read

Introducing IRIS DocDB Explorer: A Sleek UI for Managing JSON Documents in InterSystems IRIS

IRIS offers a dedicated feature for storing and retrieving JSON documents using DocDB, without requiring a predefined schema.

Developers often need a quick and intuitive way  to browse, create, and edit documents without switching between multiple tools or writing repetitive code. To solve this, I created iris-docdb-ui — a CSP-based open-source application that provides a clean, responsive interface for interacting with DocDB effortlessly.

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Article Ashok Kumar Thangavel · Oct 20, 2025 11m read

What is XML?

XML(eXtensible Markup Language) is a flexible, text-based, andplatform-independentformat used to store and transport data in a well-structured way that is both human- and machine-readable. XML permits users to define custom tags to describe the meaning and organization of their data. For example: <book><title>The Hitchhiker's Guide</title></book>.

An XML document is self-descriptive and structured as a hierarchical tree of elements. Every document has a single root element that encapsulates all other content.

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Question Ashok Kumar Thangavel · Oct 15, 2025

Hello Community,

When I compile the Sample.User class for the first time, and include an ObjectGenerator method intended to run certain logic during each compilation, it throws a <CLASS DOES NOT EXIST> error. However, recompiling the same class works as expected.

I understand this happens because the class hasn’t been fully compiled yet during the first pass. To overcome this issue, are there any specific callback methods available that can safely be used after the class is fully compiled?

Spoiler

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Question Ashok Kumar Thangavel · Sep 28, 2025

Hello Community

The InitialExpression keyword values does not to set default values for properties in classes that extend %CSP.Page, unlike in other class types such as %Persistent or %RegisteredObject, where it works as expected during object instantiation (typically via %New()).

  1. Is %CSP.Page instantiated using %New() under the hood, or does it use a different initialization mechanism?
  2. Are there specific limitations or behaviors in CSP pages that prevent InitialExpression from working as expected?

Thank you!

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Article Ashok Kumar Thangavel · Sep 8, 2025 19m read

FHIR Server

A FHIR Server is a software application that implements the FHIR (Fast Healthcare Interoperability Resources) standard, enabling healthcare systems to store, access, exchange, and manage healthcare data in a standardized manner.

Intersystems IRIS can store and retrieve the following FHIR resources:

  • Resource Repository – IRIS Native FHIR server can effortlessly store the FHIR bundles/resources directly in the FHIR repository.
  • FHIR Facade - the FHIR facade layer is a software architecture pattern used to expose a FHIR-compliant API on top of an existing one (often non-FHIR). It also streamlines the healthcare data system, including an electronic health record (EHR), legacy database, or HL7 v2 message store, without requiring the migration of all data into a FHIR-native system.

What is FHIR?

Fast Healthcare Interoperability Resources (FHIR) is a standardized framework created by HL7 International to facilitate the exchange of healthcare data in a flexible, developer-friendly, and modern way. It leverages contemporary web technologies to ensure seamless integration and communication across various healthcare systems.

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Article Ashok Kumar Thangavel · Aug 5, 2025 3m read

IrisTest is a light weight, powerful, user-friendly tool designed to simplify unit test report generation. It includes an interactive shell and API to facilitate communication, allowing developers to easily manage and generate reports for their test runs in various formats. Whether you're debugging or creating detailed reports for analysis, IrisTest makes the process smooth and efficient!

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Article Ashok Kumar Thangavel · Jul 21, 2025 13m read

This article is a continuation of the IRIS JSON project and features additional methods and insights.

Let's continue with the instance methods

%GetTypeOf(Key)

This instance method is used to determine the JSON data type of the %DynamicObject or %DynamicArray.

It returns one of the following strings:

"null" - JSON null
"boolean" - Either "true" or "false"
"number" - Any numeric value
"oref" - An %ObjectHandle (an ObjectScript oref)
"object" - A nested object
"array" - A nested array
"string" - Normal text string
"unassigned" - The value is unassigned

USER>Set1

%GetIterator()

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Article Ashok Kumar Thangavel · Jun 30, 2025 23m read

Overview

Fast Healthcare Interoperability Resources (FHIR) is a standardized framework developed by HL7 International to facilitate the exchange of healthcare data in a flexible, developer-friendly, and modern way. It leverages contemporary web technologies to ensure seamless integration and communication across healthcare systems.

Key FHIR Technologies

  • RESTful APIs for resource interaction
  • JSON and XML for data representation
  • OAuth2 for secure authorization and authentication
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Question Ashok Kumar Thangavel · Jun 27, 2025

Hello Community,

When handling a %CSP.REST API response for a custom endpoint, how can I capture or access the response content before it is written to the output buffer and sent through the Web Gateway to the UI?

In manually created REST services (for example, with a route like:<Route Url= ),
the response is typically written from within any class method in the execution flow.

Is there a way to intercept or log the response content before it is sent to the client?

Thanks!

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Question Ashok Kumar Thangavel · Jun 10, 2025

Hello Community,

I encountered the following errors while installing the ZPM module on version 2025.1. The ZPM install command failed on the Community Edition of IRIS for Health.

Skipping installation of python wheel 'attrs-25.1.0-py3-none-any.whl' due to error: '0 ;«WCould not find a suitable pip caller. Consider setting UseStandalonePip and PipCallerÓUSERÇ'e^OnAsStatus+1^%Exception.General.1^1/e^AsStatus+1^%Exception.AbstractException.1^15e^OnPhase+28^%IPM.ResourceProcessor.PythonWheel.1^1)e^%Initialize+8^%IPM.Lifecycle.Base.1^1-e^ExecutePhases+163^%IPM.Storage.Module.1^1+e^LoadNewModule+118^%IPM.Utils.Module.1^1e^Load+44^%IPM.Main.1^1"d^ShellInternal+48^%IPM.Main.1^1d^Shell+2^%IPM.Main.1^1e^ZPMLoad+3^IPM.Installer.1^1e^setup+63^IPM.Installer.1^1"e^AsyncSetup+2^IPM.Installer.1^1d^^^0'. You may need to install this wheel manually or from PyPI to use certain features of IPM.
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Question Ashok Kumar Thangavel · May 22, 2025

Hello Community,

When I run the following code with x undefined in terminal, it throws a syntax error and returns control to the program stack. After issuing a GO command, execution continues, and setting the global variable ^zz1.

code 1:

test.mac
if$Data

 if I assign the result of $D(@x@(a,b,c)) to a local variable like using , and then use , the code fails(global is not set) working as expected.

Code 2

test1.mac

So, Why The body of the if statement is not tied to the success and it sets the global in the code 1.

Thanks!

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Question Ashok Kumar Thangavel · May 7, 2025

Hello Community,

When retrieving strings from the DAO, if the string exceeds the capacity of an ObjectScript string variable, it returns <MAXSTRING>. To prevent this, use dao.%Get(key, default, "stream") to retrieve the value as a stream (%Stream.DynamicBinary). However, Why can't we use other stream objects such as %Stream.TmpCharacter instead of %Stream.DynamicBinary/%Stream.DynamicCharacter (I understand It is not possible to create a direct object instance for %Stream.Dynamic* classes) .

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Question Ashok Kumar Thangavel · Apr 15, 2025

Hello Team,

I got xDBC protocol is not compatible while executing python script. How to fix this error

C:\Users\ak\Desktop\lpyth\iris>C:/Users/ak/AppData/Local/Programs/Python/Python312/python.exe c:/Users/ak/Desktop/lpyth/iris/irisconn.py
An error occurred: connection failed: IRIS xDBC protocol is not compatible

py -m pip list
Package            Version
------------------ ---------
intersystems-iris  3.9.2

importas'hostname'{e}

Thanks!
 

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