<biography>
<name><first_name>Alan</first_name> <last_name>Turing</last_name>
</name> was one of the first people to truly deserve the name
<emphasize>computer scientist</emphasize>. Although his contributions
to the field are too numerous to list, his best-known are the
eponymous <emphasize>Turing Test</emphasize> and
<emphasize>Turing Machine</emphasize>.
<definition>The <term>Turing Test</term> is to this day the standard
test for determining whether a computer is truly intelligent. This
test has yet to be passed. </definition>
<definition>The <term>Turing Machine</term> is an abstract finite
state automaton with infinite memory that can be proven equivalent
to any any other finite state automaton with arbitrarily large memory.
Thus what is true for a Turing machine is true for all equivalent
machines no matter how implemented.
</definition>
<name><last_name>Turing</last_name></name> was also an accomplished
<profession>mathematician</profession> and
<profession>cryptographer</profession>. His assistance
was crucial in helping the Allies decode the German Enigma
machine. He committed suicide on <date><month>June</month>
<day>7</day>, <year>1954</year></date> after being
convicted of homosexuality and forced to take female
hormone injections.
</biography>
上面的例子我不作解释,但是你要知道他是一个合法的xml文件,也就是说标记和内容可以混排。但是这样格式的xml文件在程序的处理上就很麻烦,所以不推荐使用。