For the attribute printer-icc-profiles, the datatype is 1setOf collection.
As per the IANA IPP Registrations, the registered member attributes of this collection are:
In IPP Driver Replacement Extensions v2.0 (PWG 5100.13), Section 6.5.34 defines printer-icc-profiles as a 1setOf collection. However, this section appears to list profile-uri as a collection member and does not mention profile-url. Additionally, the surrounding explanatory text references profile-uri, which adds to the confusion when interpreting the collection membership. Refer to screenshot below

In contrast, Section 16.2 (Attribute Registrations) of the same document clearly registers the collection with the following members:
profile-name
profile-url
For the attribute printer-icc-profiles, the datatype is 1setOf collection.
As per the IANA IPP Registrations, the registered member attributes of this collection are:
In IPP Driver Replacement Extensions v2.0 (PWG 5100.13), Section 6.5.34 defines printer-icc-profiles as a 1setOf collection. However, this section appears to list profile-uri as a collection member and does not mention profile-url. Additionally, the surrounding explanatory text references profile-uri, which adds to the confusion when interpreting the collection membership. Refer to screenshot below