Metadata mapping for service providers is crucial as it enhances the discoverability of digital resources. Recognizing the common notion that 'any mapping would compromise metadata quality,' metadata mapping for service providers often involves translating specific locally developed metadata schemas into a standardized set of metadata, typically Dublin Core. This is especially challenging for metadata specialists and digital collections curators who need to strike a balance between facilitating discovery and meeting specific descriptive needs, particularly for digital collections originating from special collections. This poster will delve into the roles of metadata in supporting the discovery, access, and management of digital resources. It will then explore how library systems address these specific metadata needs by leveraging reusable metadata profiles. The poster will also offer guidance and strategies on using a defined set of metadata elements for service providers to enhance discoverability.