artifact support in eduGAIN metadata

[Tom Scavo]

I don't know if this is useful info for the development work going on
right now but maybe some will find it interesting in any case.

TL;DR Here are the most interesting bits:
- There are ZERO <SourceID> elements in eduGAIN metadata
- There are eight (8) ArtifactResolutionService endpoint locations
associated with more than one IdP (which makes SAML1 Type 2 artifacts
difficult to support)
- Fortunately, ZERO SPs in eduGAIN metadata support SAML1 Type 2 artifacts
- ONE IdP in eduGAIN metadata accepts SAML2 artifacts (for SLO)
- 735 (41.7%) SPs issue SAML2 artifacts (despite the previous fact)

Other than that, the number and percentage of entities that support
artifacts in various ways are not too surprising. See below for
details.

The XSLT script used for this analysis is in GitHub:
https://gist.github.com/trscavo/a269860955c7f024c3a709fa998db6fa

Tom

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(a) There are 2573 IDPSSODescriptors in eduGAIN metadata

(b) There are eight (8) ArtifactResolutionService endpoint locations
associated with more than one IdP

(c) 1447 (56.2%) IdPs issue either SAML2 or SAML1 artifacts (or both)
(d) 1434 (55.7%) IdPs issue SAML2 artifacts
(e) 1356 (52.7%) IdPs issue SAML1 artifacts
(f) 1343 (52.2%) IdPs issue both SAML2 and SAML1 artifacts
(g) 1126 (43.8%) IdPs do not issue artifacts of any kind

(h) ONE IdP accepts SAML2 artifacts for SLO
(i) ZERO IdPs accept SAML2 artifacts for SSO

(j) There are 1762 SPSSODescriptors in eduGAIN metadata

(k) ZERO SPs support SAML1 Type 2 artifacts

(l) 1415 (80.3%) SPs accept or issue an artifact of some type for some purpose
(m) 347 (19.7%) SPs neither accept nor issue artifacts of any type for
any purpose

(n) 1414 (80.2%) SPs accept an artifact of some type for some purpose
(o) 348 (19.8%) SPs do not accept artifacts of any type for any purpose

(p) 770 (43.7%) SPs accept SAML2 artifacts for SLO

(q) 1406 (79.8%) SPs accept either SAML2 or SAML1 artifacts (or both) for SSO
(r) 1385 (78.6%) SPs accept SAML2 artifacts for SSO
(s) 1089 (61.8%) SPs accept SAML1 artifacts for SSO
(t) 1068 (60.6%) SPs accept both SAML2 and SAML1 artifacts for SSO
(u) 356 (20.2%) SPs do not accept artifacts for SSO

(v) 735 (41.7%) SPs issue SAML2 artifacts