快速开始Perl XML：接口篇

入门简介

CPAN上的XML模块可以分成三大类：对 XML 数据提供独特的接口（通常有关在XML实例和Perl数据之间的转换），实现某一标准XML API的模块，和对一些特定的XML相关任务进行简化的特殊用途模块。这个月我们先关注第一个，XML Perl专用接口。

use Disclaimer qw(:standard);

任务

任务一：提取数据

<?xml version="1.0"?>
<camelids>
  <species name="Camelus dromedarius">
    <common-name>Dromedary, or Arabian Camel</common-name>
    <physical-characteristics>
      <mass>300 to 690 kg.</mass>
      <appearance>
        The dromedary camel is characterized by a long-curved 
        neck, deep-narrow chest, and a single hump.
        ...
      </appearance>
    </physical-characteristics>
    <natural-history>
       <food-habits>
         The dromedary camel is an herbivore.
         ...
       </food-habits>
       <reprodUCtion>
         The dromedary camel has a lifespan of about 40-50 years
         ...
       </reproduction>
       <behavior>
         With the exception of rutting males, dromedaries show
         very little aggressive behavior.
         ...
       </behavior>
       <habitat>
         The camels prefer desert conditions characterized by a
         long dry season and a short rainy season.
         ...
       </habitat>
    </natural-history>
    <conservation status="no special status">
      <detail>
        Since the dromedary camel is domesticated, the camel has
        no special status in conservation.
      </detail>
    </conservation>
  </species>
  ...
</camelids>

Bactrian Camel (Camelus bactrianus) endangered 
Dromedary, or Arabian Camel (Camelus dromedarius) no special status 
Llama (Lama glama) no special status 
Guanaco (Lama guanicoe) special concern
Vicuna (Vicugna vicugna) endangered

任务二：创建一个XML文档

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