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/**
 * Public, framework-agnostic PKI API.
 *
 * <p>
 * This package provides stable entry points and core value types for operating
 * a PKI instance. The API is intentionally independent of any concrete
 * certificate framework (for example X.509), allowing multiple frameworks to be
 * integrated via SPIs in {@code zeroecho.pki.spi.*}.
 * </p>
 *
 * <h2>Design principles</h2>
 * <ul>
 * <li><strong>Framework independence:</strong> the API models PKI concepts (CA,
 * issuance, revocation, status objects, publication, backup/restore) without
 * binding to a single certificate technology.</li>
 * <li><strong>Explicit commands and queries:</strong> mutable operations are
 * expressed as command objects and retrieval via query objects in
 * subpackages.</li>
 * <li><strong>Safety and auditability:</strong> security-relevant operations
 * are designed to be auditable; sensitive data must never be exposed by API
 * abstractions.</li>
 * </ul>
 *
 * <h2>Key entry points</h2>
 * <ul>
 * <li>{@link zeroecho.pki.api.CaService}</li>
 * <li>{@link zeroecho.pki.api.CertificationRequestService}</li>
 * <li>{@link zeroecho.pki.api.IssuanceService}</li>
 * <li>{@link zeroecho.pki.api.RevocationService}</li>
 * <li>{@link zeroecho.pki.api.StatusObjectService}</li>
 * <li>{@link zeroecho.pki.api.PublicationService}</li>
 * <li>{@link zeroecho.pki.api.ProfileService}</li>
 * <li>{@link zeroecho.pki.api.PolicyService}</li>
 * <li>{@link zeroecho.pki.api.ImportExportService}</li>
 * <li>{@link zeroecho.pki.api.BackupService}</li>
 * </ul>
 *
 * <p>
 * Subpackages further organize domain models: {@code ca}, {@code issuance},
 * {@code request}, {@code revocation}, {@code status}, {@code publication},
 * {@code profile}, {@code policy}, {@code transfer}, plus attribute and audit
 * domains in {@code attr} and {@code audit}.
 * </p>
 *
 * @since 1.0
 */
package zeroecho.pki.api;
