title: What is the full form of "SPI" in the Spring 3 type conversion system?
body: <p>What does the acronym "SPI" stand for in the <a href="http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/validation.html#core-convert" rel="noreferrer">Spring 3 type conversion API</a>?</p>