Add Dataset example 7 - Calibration dataset

dataset/example07/README.md

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+---
+SPDX-FileType: DOCUMENTATION
+SPDX-License-Identifier: CC-BY-4.0
+---
+
+# Dataset example 7 - Calibration dataset
+
+## Description
+
+This example illustrates an SBOM for a calibration dataset: measurement
+records from testing 120 industrial pressure sensors against a certified
+reference standard. Calibration datasets are used by laboratories and
+manufacturers to verify that instruments measure correctly.
+
+The dataset (~50 MB, CSV + JSON) is published openly under CC-BY-4.0 with a
+DOI, which motivates using `externalIdentifier` to record the persistent
+citation reference.
+
+Because the data was collected using reference instruments (deadweight tester,
+thermometer, barometer, humidity sensor), `/Dataset/sensor` documents those
+instruments and their calibration specifications - distinct from the 120
+pressure sensors being tested.
+
+## Profile conformance
+
+`core`, `dataset`
+
+## SPDX files
+
+| Version | File |
+| ------- | ---- |
+| SPDX 3.0 | [spdx3.0/example07.spdx3.json](./spdx3.0/example07.spdx3.json) |
+| SPDX 3.1 (draft) | [spdx3.1/example07.spdx3.json-draft](./spdx3.1/example07.spdx3.json-draft) |
+
+[![A diagram of Dataset example 7 - Pressure sensor calibration dataset.](./example07.spdx3.png "A diagram of Dataset example 7 - Pressure sensor calibration dataset.")](./example07.spdx3.png)
+
+## Key properties demonstrated
+
+| Property | Notes |
+| -------- | ----- |
+| `/Dataset/confidentialityLevel` | `clear` - openly published under CC-BY-4.0 |
+| `/Dataset/dataCollectionProcess` | Accreditation standard (ISO/IEC 17025) and measurement protocol (EURAMET cg-17 v4) |
+| `/Dataset/datasetSize` | `52428800` bytes (~50 MB) - deprecated in SPDX 3.1, use `/Software/artifactSize` |
+| `/Dataset/datasetType` | `numeric`, `structured` - tabular numerical measurement records |
+| `/Dataset/datasetUpdateMechanism` | Annual re-certification adds new sensors; historical records unchanged |
+| `/Dataset/hasSensitivePersonalInformation` | `no` |
+| `/Dataset/intendedUse` | Software validation, accreditation audits, education - deprecated in SPDX 3.1, use `/Core/intendedUse` |
+| `/Dataset/knownBias` | Single-site elevation effect on absolute sensors; limited to three sensor manufacturers |
+| `/Dataset/sensor` | 4 reference instruments used during data collection, with model and uncertainty details |
+| `/Software/File` + `contains` | 14 files inside the package: 6 CSV measurement batches, 6 JSON certificate batches, 1 PDF methodology report, 1 README |
+| `/Software/File/contentType` | IANA media type per file: `text/csv`, `application/json`, `application/pdf`, `text/markdown` |
+| `externalIdentifier` | DOI assigned by DataCite for persistent citation |