On these pages we will often group applications into application categories. It will sometimes be useful to group attributes into various attribute bundles based on their common applicability to a set of use cases. A given attribute bundle may be associated with a particular application category when the attributes in that bundle are generally required or useful for the operation of applications in that category.
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"An example of how a variety of attributes can be provided to a replying party for proper presentation of a web site to an identity having specialized access needs."
credits: Access for all abstract model from ISO/IEC 24751-1