XML SAX：在一个示例XML文件中解释`qName`和`localName`的结果
我正在测试如何使用SAXParser并了解其组件。 这是我用来测试的XML文件：
NASA Image of the Day http://www.nasa.gov/multimedia/imagegallery/index.html The latest NASA "Image of the Day" image. en-us http://blogs.law.harvard.edu/tech/rss yvette.smith-1@nasa.gov brian.dunbar@nasa.gov Expedition 30 Cosmonauts Perform Spacewalk http://www.nasa.gov/multimedia/imagegallery/image_feature_2181.html This image of Russian cosmonauts Oleg Kononenko and Anton Shkaplerov, both Expedition 30 flight engineers, was taken during a spacewalk on Thursday, Feb. 16, 2012. During the six-hour, 15-minute spacewalk, Kononenko and Shkaplerov moved the Strela-1 crane from the Pirs Docking Compartment in preparation for replacing it in 2012 with a new laboratory and docking module. The duo used another boom, the Strela-2, to move the hand-operated crane to the Poisk module for future assembly and maintenance work. Both telescoping booms extend like fishing rods and are used to move massive components outside the station. On the exterior of the Poisk Mini-Research Module 2, they also installed the Vinoslivost Materials Sample Experiment, which will investigate the influence of space on the mechanical properties of the materials. The spacewalkers also collected a test sample from underneath the insulation on the Zvezda Service Module to search for any signs of living organisms. Both spacewalkers wore Russian Orlan spacesuits bearing blue stripes and equipped with NASA helmet cameras. Image Credit: NASA http://www.nasa.gov/multimedia/imagegallery/image_feature_2181.html Wed, 22 Feb 2012 00:00:00 EST
当我使用SAXParser测试这个文件时，这是我的输出的一些行：
start Element: rss Local Name // this line I don't know why null qNam: rss start characters: start Element: channel Local Name qNam: channel start characters:
我的问题是：在我的XML文件中，没有namespace因此每个元素都属于其默认namespace ，并且为什么qName将等于local Name （因为没有qName prefix ）。
但是在上面的结果中，在元素rss和channel （以及我尚未发布的所有其他内容）中， local Name为空！
请问谁可以帮我解释一下。
谢谢 ：）
这在Javadoc中有点不清楚：
uri – 名称空间URI，如果元素没有名称空间URI或者没有执行名称空间处理，则为空字符串
localName – 本地名称（不带前缀），如果未执行名称空间处理，则为空字符串
qName – 限定名称（带前缀），如果限定名称不可用，则为空字符串
atts – 附加到元素的属性。 如果没有属性，则它应为空的Attributes对象。 startElement返回后此对象的值未定义
关闭命名空间处理后，仅返回qName （没有前缀）。