For the text and altText properties, using bracket notation (name[language] and image.altText[language]) allows for dynamic localization. This syntax accesses a property on the name or image.altText data objects using the value of the language variable. This ensures the card displays text in the appropriate language provided in the data source.

The $when property controls an element's visibility. The expression "${stockLevel != 'OK'}" makes the TextBlock (and its associated "Attention" color) appear only when the stock level is not 'OK'. This is the correct logic for displaying a warning message.

Microsoft. (n.d.). Adaptive Card Templating Language. Adaptive Cards. This official documentation explains the data binding syntax ${...}, conditional inclusion with the $when property, and how the templating language evaluates expressions, including object property access via bracket notation (e.g., object[propertyName]). Retrieved from https://adaptivecards.io/templating/language/

Microsoft. (n.d.). Schema Explorer. Adaptive Cards. The official schema explorer details the valid properties for each element type. For the TextBlock element, it documents the $when property for conditional rendering and the color property, which accepts values like "Attention". Retrieved from https://adaptivecards.io/explorer/TextBlock.html