This document discusses the California Digital Library's (CDL) role in supporting data management and sharing. It notes that mandates, funding, and mission are driving factors for data sharing. The CDL takes a life cycle approach to data, offering tools and services at all stages from planning to publication. This includes tools for data management plans, data collection, identifiers, curation repositories, and publishing. Persistent identifiers through EZID are highlighted as helping researchers track results, organize data, get citations, and meet funder requirements. The document promotes adoption of identifiers and their role in supporting indexing and discovery of data.