Final answer:
Side portals and radiating chapels are key features of the Cathedral of Saint James as a pilgrimage church.
Explanation:
Side portals and radiating chapels are features of the Cathedral of Saint James that help identify it as a pilgrimage church. These portals allowed for the easy flow of pilgrims in and out of the church without disrupting the central Mass. Radiating chapels, where relics were often displayed, offered pilgrims spaces to venerate the relics.
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