Which document types are considered rich in metadata?

• A. TXT
• B. MP3
• C. PNG
• D. PDF, DOT, DOCX, XLS, PPTX, JPG, HTML

Answer: (D)

Rich metadata is metadata that is embedded directly within the file’s structure, allowing you to read information like author, creation date, subjects, keywords, and other properties without needing separate sidecar files. Formats in this set are built to carry substantial metadata: PDFs include core info and XMP metadata that describe the document and its history; Office Open XML formats (DOCX, XLSX, PPTX) are packaged containers with XML parts that store core properties and custom properties; DOT graphs can include attributes that describe graph metadata; JPEG images store EXIF and IPTC data with camera info, timestamps, and descriptive tags; HTML documents include meta tags in the head and can embed semantic metadata via RDFa, microdata, or JSON-LD. Plain text files lack such embedded metadata, making them sparse by comparison, and while metadata exists in audio formats like MP3, those are not document types, which is why the listed document formats are highlighted as rich in metadata.