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Demonstrations Metadata

This document describes the structure of the JSON files that hold the metadata for the demonstrations.

The metadata JSON file for a given demo should be stored in the same folder as the Python demo file. It should have exactly the same name, except ending with .metadata.json instead of .py.

Example

Below is given an example of a complete metadata file for a demonstration.

{
    "title": "Basic arithmetic with the quantum Fourier transform (QFT)",
    "authors": [
        {
            "id": "guillermo_alonso"
        }
    ],
    "dateOfPublication": "2022-11-07T00:00:00+00:00",
    "dateOfLastModification": "2023-01-20T00:00:00+00:00",
    "categories": ["Getting Started"],
    "tags": ["quantum Fourier transforms", "qft"],
    "previewImages": [
        {
            "type": "thumbnail",
            "uri": "/_images/thumbnail_tutorial_qft_arithmetics.png"
        },
        {
            "type": "large_thumbnail",
            "uri": "/_static/demo_thumbnails/large_demo_thumbnails/thumbnail_large_tutorial_<name>"
        },
        {
            "type": "hero_image",
            "uri": "/_static/hero_illustrations/qft_arithmetics_hero.png"
        }
    ],
    "seoDescription": "Learn how to use the quantum Fourier transform (QFT) to do basic arithmetic",
    "doi": "",
    "canonicalURL": "/qml/demos/tutorial_qft_arithmetics",
    "references": [
        {
            "id": "Draper2000",
            "type": "preprint",
            "title": "Addition on a Quantum Computer",
            "authors": "Thomas G. Draper",
            "year": "2000",
            "doi": "10.48550/arXiv.quant-ph/0008033",
            "url": "https://arxiv.org/abs/quant-ph/0008033"
        }
    ],
    "basedOnPapers": [],
    "referencedByPapers": [],
    "relatedContent": [
        {
            "type": "demonstration",
            "id": "tutorial_qubit_rotation",
            "weight": 1.0
        }
    ],
    "hardware": [
        {
            "id": "aws",
            "link": "https://pennylane.ai/qml/demos/tutorial_quantum_transfer_learning",
            "logo": "/_static/hardware_logos/aws.png"
        }
    ]
}

Properties

The table below gives details about the fields in the metadata JSON file for version 0.1.0.

Name Is Required Value Type Description
title Yes string The title of this demo.
authors Yes array of object An array of the authors of this demo. This array must contain at least one item. See below for the object structure.
dateOfPublication Yes datetime The date on which this demo was first published, in the form YYYY-MM-DDTHH:MM:SS+00:00.
dateOfLastModification Yes datetime The date on which this demo was last modified, in the form YYYY-MM-DDTHH:MM:SS+00:00.
categories Yes array of string An array of the categories that this demo is in. The currently-available categories are: Getting Started, Optimization, QML, Quantum Chemistry, Quantum Computing, and Community.
tags Yes, but can be an empty array array of string An array of the tags that this demo has.
previewImages Yes array of object An array of the different images that can be used as previews for this demo - e.g., thumbnails, social media cards (perhaps of different aspect ratios). See below for the object structure.
seoDescription Yes string A description of the demo suitable for SEO purposes. Ideally this should be less than 150 characters, but this is not a strict limit. It should be a full, grammatically-correct sentence ending in a full stop.
doi Yes, but can be an empty string string The DOI for this demo.
canonicalURL Yes url The canonical URL for this demo. Sometimes there might be more than one URL that points to a given page on a website. The canonical URL defines which of these should be thought of as the primary or main one.
references Yes array of object An array of the references used for this demo. See below for object structure.
basedOnPapers Yes, but can be an empty array array of string An array of the DOIs for the papers this demo is based on.
referencedByPapers Yes, but can be an empty array array of string An array of the DOIs of any papers that reference this demo.
relatedContent Yes, but can be an empty array array of object An array of objects describing the content related to this demo. See below for the object structure.
hardware No. Can be an empty array. array of object An array of objects representing third-party vendors who can run the demo on their hardware. See below for the object structure.

Author Object Properties

Name Is Required Value Type Description
id Yes string The id of this author.
affiliation No string The affiliation of this author - often the university they work at.

Preview Image Object Properties

Name Is Required Value Type Description
type Yes string What type of preview image this is. At the moment, the only value this can take is thumbnail, which refers to the image used on the QML part of pennylane.ai when browsing through lists of demos.
uri Yes string The URI of this image, whether it be something hosted locally or on another site.

Reference Object Properties

Name Is Required Value Type Description
id Yes string An id for this reference used for citing it within the demo.
type Yes string The type of this reference. Can be one of: article, book, phdthesis, preprint, webpage
title Yes string The title of the paper or book being referenced.
authors Yes string The authors of the paper or book being referenced, as a single string. Names should be comma-separated, and the Oxford comma should be used when there are 3 or more names, and before 'et al.'.
year Yes string The year in which the paper or book was published.
month No string The month in which the paper or book was published.
journal No string The journal that the paper was published in. (Not relevant for books.)
publisher No string The publisher of the book. (Not relevant for papers.)
doi No string The DOI of the paper. (Not the DOI URL - just the DOI.)
url No string The URL of the paper or webpage.
pages No string The specific pages of a journal or book being referenced, as a mixed list of individual pages and page ranges - i.e., 57, 61-63, 67, 102-104.
volume No string The volume of the journal or the multi-volume book.
number No string The number of the journal.

Related Content Object Properties

Name Is Required Value Type Description
type Yes string The type of content that this relation refers to. So far, can only be demonstration, but this will be expanded in future.
id Yes string The id of the content that this relation refers to. For demos, it's the file name of the demo without the extension - i.e., tutorial_haar_measure.
weight Yes number A number between -1.0 and 1.0 indicating both how closely related these two pieces of content are, and which one it is preferable to encounter first. A value of 1.0 indicates that these two pieces of content are very closely related, and this one should be read first, and the linked one second. A value of -1.0 indicates again that these two pieces of content are very closely related, but that the linked one should be read first. A value of 0.0 indicates that these two pieces of content have nothing to do with each other.

Hardware Object Properties

Name Is Required Value Type Description
id Yes enum The ID of the hardware vendor
link Yes string Link to run the demo on the vendor's hardware
logo Yes string The URI of the vendor's logo image, whether it be something hosted locally or on another site.

An Empty Template

{
    "title": "",
    "authors": [
        {
            "id": "",
            "affiliation": ""
        },
        {
            "id": "",
            "affiliation": ""
        }
    ],
    "dateOfPublication": "",
    "dateOfLastModification": "",
    "categories": [],
    "tags": [],
    "previewImages": [
        {
            "type": "thumbnail",
            "uri": ""
        }
    ],
    "seoDescription": "",
    "doi": "",
    "canonicalURL": "",
    "references": [
        {
            "id": "",
            "type": "",
            "title": "",
            "authors": "",
            "year": "",
            "journal": "",
            "url": ""
        },
        {
            "id": "",
            "type": "",
            "title": "",
            "authors": "",
            "year": "",
            "journal": "",
            "url": ""
        },
        {
            "id": "",
            "type": "",
            "title": "",
            "authors": "",
            "year": "",
            "journal": "",
            "url": ""
        }
    ],
    "basedOnPapers": [],
    "referencedByPapers": [
        {
            "type": "demonstration",
            "id": "",
            "weight": 1.0
        },
        {
            "type": "demonstration",
            "id": "",
            "weight": 1.0
        },
        {
            "type": "demonstration",
            "id": "",
            "weight": 1.0
        }
    ],
    "relatedContent": [],
    "hardware": []
}

Validation

The best way to ensure that your metadata file is consistent with the spec outlined here is to validate it. Install and run check-jsonschema against the version of the spec defined above:

pip install check-jsonschema 'jsonschema[format]'
cd metadata_schemas
check-jsonschema --schemafile demo.metadata.schema.<version>.json ../demonstrations/<your_demo_name>.metadata.json