AI-102 Practice Question: Implement knowledge mining and information extraction solutions
You are designing a knowledge mining solution for a publishing company that needs to extract metadata from thousands of book manuscripts in various formats (PDF, Word, EPUB). The solution must identify authors, publication dates, and chapter titles. You are using Microsoft Foundry with Azure AI Search and Azure AI Document Intelligence. The manuscripts are stored in Azure Blob Storage. You need to ensure that the solution can handle all file formats. You have configured a skillset with a Document Intelligence skill for the PDFs and Word documents. However, the EPUB files are not being processed. What should you do to include EPUB files in the enrichment pipeline?
⚠ Common exam trap
AI-102 often tests the assumption that Document Intelligence supports all document formats, but it does not support EPUB, leading candidates to incorrectly choose option A or C.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Develop a custom skill that converts EPUB files to plain text and add it to the skillset.
Azure AI Document Intelligence does not natively support EPUB files, so the built-in Document Intelligence skill cannot process them. To include EPUB files in the enrichment pipeline, you must create a custom skill that converts EPUB to plain text (or another supported format) and then add it to the skillset. This allows the pipeline to handle EPUB content alongside PDFs and Word documents.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Azure AI Document Intelligence to extract text from EPUB files directly.
Why it's wrong here
Azure AI Document Intelligence does not accept EPUB as an input format; its model supports PDF, images, Office and HTML. EPUB must be converted to a supported format before the skill processes it. Using it directly is tempting because it handles many document types, but EPUB falls outside that supported set.
- ✓
Develop a custom skill that converts EPUB files to plain text and add it to the skillset.
Why this is correct
Document Intelligence's built-in skill only supports its documented formats, so EPUB is skipped. A custom skill converts EPUB to plain text before enrichment, letting the remaining skillset extract authors, dates and chapter titles from every manuscript format stored in Blob Storage.
- ✗
Modify the Document Intelligence skill to accept EPUB files.
Why it's wrong here
The Document Intelligence skill accepts only its supported input formats, and EPUB is not among them; no parameter change adds EPUB support. Converting EPUB to PDF or plain text before enrichment is the workable route. Modifying the skill is tempting because skills appear configurable, but their accepted input formats are fixed by the service.
- ✗
Register a new data source type for EPUB in Azure AI Search.
Why it's wrong here
Azure AI Search supports fixed data source types such as Azure Blob Storage; no custom EPUB type can be registered. EPUB files must be converted to a supported format before indexing. Registering a data source type is tempting because connectors exist for other repositories, but extensibility lies in skillsets and custom skills, not data source types.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Microsoft exam blueprint
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