AI-103: Developing AI Apps and Agents on Azure

In Azure Content Understanding's fieldSchema, each field defines a 'type' (value type) and a 'method' (how the value is populated). The value type 'string' is used for natural-language text output such as a description of a color scheme. The method 'generate' is used when the model must infer or interpret content rather than extract literal text or classify into a fixed enum — this is required for video analyzers since 'extract' is supported only for document analyzers. Microsoft's official video documentation explicitly cites 'Color scheme' as an example custom field used to convey mood and atmosphere in each video segment, and demonstrates comparable descriptive fields (e.g., brandLogo) configured with "type": "string" and "method": "generate". Since describing a segment's color scheme requires the generative model to interpret and synthesize a description from the visual frames rather than copy literal text or pick from a fixed category list, 'string' + 'generate' is the correct configuration.