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In this module, you’ll create a TemplateMark template that uses the Concerto model you defined in Module 1. TemplateMark allows you to create dynamic templates with variables that get replaced with actual data at runtime.
Learn more about TemplateMark in the TemplateMark specification

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What you’ll build

You’ll create a simple template that displays “Hello” followed by a dynamic name variable. This template will use the name property from your HelloWorld model.

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Creating your template

Open the TemplateMark editor and follow along:
1

Write the basic template

Create a template with plain text and a variable placeholder. Variables in TemplateMark are enclosed in double curly braces {{ and }}.
Hello {{name}}.
This template consists of:
  • Plain text: "Hello" and "."
  • A variable: {{name}} that will be replaced with actual data
2

Test the template

The playground will automatically validate your template against the Concerto model. The name variable corresponds to the name property you defined in the HelloWorld concept.

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Understanding TemplateMark syntax

TemplateMark uses a simple syntax for dynamic content:
  • {{variableName}} - Inserts the value of a variable
  • Variables must match property names in your Concerto model
  • You can combine variables with any markdown formatting

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Enhanced example

Here’s a more sophisticated template that includes markdown formatting: 
> The one, the only...

### Hello {{name}}!
This template uses:
  • A blockquote (>) for emphasis
  • A heading (###) for structure
  • The {{name}} variable for dynamic content

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Working with different data types

TemplateMark supports various data types and formatting options:

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String variables

Hello {{name}}.

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Date formatting

You can format dates using the as keyword: 
**Release Date:** {{releaseDate as "D MMMM YYYY"}}
This formats a DateTime value like 2024-10-01 as 1 October 2024.

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Multiple variables

You can use multiple variables in a single template: 
### Introducing {{productName}}

{{description}}

**Release Date:** {{releaseDate as "D MMMM YYYY"}}

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Real-world example

Here’s a complete product announcement template: Model: 
namespace hello@1.0.0

@template
concept ProductAnnouncement {
    o String productName
    o String description
    o DateTime releaseDate
}
Template: 
> Product announcement template.

### Introducing {{productName}}

{{description}}

**Release Date:** {{releaseDate as "D MMMM YYYY"}}
This demonstrates how templates can combine multiple variables with rich markdown formatting to create professional-looking documents.

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Template validation

The playground automatically validates your template to ensure:
  • All variables exist in the Concerto model
  • Variable names are spelled correctly
  • Data types are compatible with any formatting you’ve applied
If you reference a variable that doesn’t exist in your model, you’ll see an error message.

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Next steps

Now that you’ve created your template, proceed to Module 3: Data binding to generate JSON data that will populate your template variables.

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Key concepts

TemplateMark is a markdown-based templating language that allows you to create dynamic documents with variable placeholders. It’s part of the Accord Project’s markdown-transform library.
Variables in TemplateMark are enclosed in {{ and }}. At runtime, these placeholders are replaced with actual values from your data object. Variable names must match property names in your Concerto model.
Yes! TemplateMark supports full markdown syntax, including headings, lists, blockquotes, bold, italic, links, and more. You can combine any markdown with your template variables.
Use the as keyword followed by a format string. For example, {{date as "YYYY-MM-DD"}} formats a date. Different data types support different formatting options.

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