Java API for XML Processing (JAXP) enables applications toparse,transform,validate and query XML documents using an API that isindependent of a particular XML processor implementation.
JAXP specification provides a way to map Java classes to XMLrepresentations，是JCP的标准之一：
- JAXP 1.0，JSR-5
- JAXP 1.1~1.2，JSR-63
- JAXP 1.3~1.6，JSR-206
JAXP project的主要目的就是开发并维护JAXP RI，当前最新版是2014.3发布的JAXP RI 1.6.0。JAXPproject已经终止，JAXP后续开发已经转入OpenJDK社区的CoreLibraries组。
从JDK4开始，JAXP成为JDK的组成部分：
- JAXP 1.1 in JDK 4
- JAXP 1.3 in JDK 5
- JAXP 1.4 in JDK 6
- JAXP 1.5 in JDK 7 u40
- JAXP1.6.0 in JDK 8
two main parts in JAXP:
- a parsing API
Xerces XML parser
- a transform API
Xalan XSLT processor
参考文献：
JAXP project官网https://jaxp.java.net/
