The WSO2 integration runtime engine is capable of playing multiple roles in your enterprise architecture. It can act as an ESB or a microservices integrator. When deployed as an ESB, it caters to your message routing, transformation, message mediation, service orchestration, as well as service and API hosting needs. Header-based, content-based, rule-based, and priority-based routing. Implement Enterprise Integration Patterns (EIPs), database integration, event stream integrations. Transform messages with XSLT 1.0/2.0, XPath, XQuery, and Smooks. Visual data mapping, CSV, JSON, and XML transformation connectors. Supports any RDBMS, CSV, Excel, ODS, Cassandra, and Google spreadsheets. Supports OData v4 protocol for any RDBMS and Cassandra data sources. Supports MSSQL, DB2, Oracle, OpenEdge, TerraData, MySQL, PostgreSQL/EnterpriseDB, H2, Derby or any database with a JDBC driver. Support for nested queries across data sources.