Discovery Service lists IdPs by organization name. Organization logo is shown on the right side of the name.
The source for both organization name and logo is eduGAIN metadata.
Organization name is read from the following metadata elements in this particular order:
<mdui:DisplayName> within <mdui:UIInfo>
<md:OrganizationDisplayName> within <md:Organization>
<md:OrganizationName> within <md:Organization>
Discovery Service selects logo from <mdui:Logo> elements using following process:
the first logo with 40 pixels height and en language
the first logo with 40 pixels height and any language
the first logo with en language
the largest logo
The selected logo is scaled to 40 pixels height if necessary. PNG is the recommeded format for the logo.
See SAML V2.0 Metadata Extensions for Login and Discovery User Interface Version 1.0 and eduGAIN Policy Framework Metadata Profile for more details.