user_icon_fragments.yaml

%YAML 1.2
# -*- coding: UTF-8, tab-width: 4 -*-
---

^:
    wp_vector_anon:
        'as:icon':
            # https://www.w3.org/TR/activitystreams-vocabulary/#dfn-icon
            type:   'Image'
            name:   'Silhouette for a generic humanoid person'
            url:    'https://en.wikipedia.org/w/skins/Vector/resources/skins.vector.styles.legacy/images/user-avatar.svg'
            width:  20
            height: 20


...