XRD for Python

Extensible Resource Descriptor is a generic format for describing and discovering resources.

python-xrd supports serialization and deserialization of both:

• XML as defined in XRD 1.0, execpt XRD Signature and XRDS.
• JSON (JRD) as defined in RFC 6415

Basic Usage

from xrd import XRD, Link, Title

xrd = XRD(
    subject="http://example.com/someone",
    properties={"http://spec.example.net/type/person": None},
    links=[
        Link(
            rel="http://spec.example.net/photo/1.0",
            type="image/jpeg",
            href="http://photos.example.com/someone.jpg",
            titles=[Title("User Photo", lang="en"), Title("Benutzerfoto", lang="de")],
            properties={"http://spec.example.net/created/1.0": "1970-01-01"}],
        )
    ],
)
xrd.as_xml()

Tests

Test Completeness

It's important to ensure test cases were covered for all combinations of XML/JSON and ser/deser, so completeness is tracked in this chart. There are additional tests, but these are the ones that need to be the same for all.

Test	XML Ser	XML Deser	JSON Ser	JSON Deser
xml:id	✓	✓	n/a	n/a
xml attributes	✓	✓	n/a	n/a
expires	✓	✓	✓	✓
subject	✓	✓	✓	✓
alias	✓	✓	✓	✓
property	✓	✓	✓	✓
property / nil	✓	✓	✓	✓
property / multi *	✓	✓	✓	✓
link	✓	✓	✓	✓
link / validate	✓	✓	✓	✓
link / title	✓	✓	✓	✓
link / property	✓	✓	✓	✓
link / property / nil	✓	✓	✓	✓
link / property / multi *	✓	✓	✓	✓
XRDS	✕	✕	n/a	n/a
signature **	✕	✕	n/a	n/a

* JRD does not support multiple properties of the same type, per the spec. When serializing to JSON only the last value will be used if there are multiple properties of the same type.

** XRD Signature is not supported