本篇包括Charpter 10 XLink。
XLink相比html的anchor来说要抽象许多了，而它能表示的内容也广泛很多，从某种角度来说xlink定义的是graph而不仅仅是link这么简单，通过locator跟resource定义点，通过arc定义边，从而构成任意的图。
要点如下：
1.XLink的namespace是http://www.w3.org/1999/xlink。XLink主要分为两种类型，simple跟extended。
2.Simple的xlink定义如下，可以使用xlink:show（可选值为new，replace，embed，other，none）跟xlink:actuate（可选值为onLoad，onRequest，other，none）这两个attribute来控制其行为，可以通过xlink:title跟xlink:role来描述其语义，其中title是一段文字，role是某个url。
<novel xlink:type = "simple" xlink:href = "ftp://archive.org/pub/etext/etext93/wizoz10.txt"/>
3.Extended的xlink通过定义点和边来描述一个图，所有的点和边的定义必须包含在含有xlink:type="extended"的element中，本地资源采用xlink:type="resource"定义，非本地资源采用xlink:type="locator"定义，边采用xlink:type="arc"定义。Resource跟locator都可以使用xlink:title跟xlink:role来描述其语义，同时使用xlink:label来为其命名，使其可以被arc引用。Arc用xlink:title跟xlink:arcrole来描述其语义，同时使用xlink:from跟xlink:to来描述其起始及终结的点，其中由于不同的resource或者locator可能有同个label，这个时候arc描述的是若干条边，而通过省略xlink:from或xlink:to可以选择所有的点，最后需要注意的是在同个extended的xlink下面，不同的arc所描述的边不能由重复（交集），否则视为错误。例子如下：
<author xlink:type="resource">L. Frank Baum</author>
<edition xlink:type="locator" xlink:href="urn:isbn:0688069444" xlink:title="William Morrow" xlink:role="http://www.williammorrow.com/" xlink:label="ISBN0688069444"/>
<purchase xlink:type="arc" xlink:from="ISBN0192839306" xlink:to="buy" xlink:arcrole="http://www.example.com/purchase_details.txt" />
4.在非本地资源间的边称为third-party links，从本地资源到非本地资源的边成为outbound links，从非本地资源到本地资源的边成为inbound links，如果一个xml document含有third-party links或者inbound links称为linkbase。
5.书中列举了两个在dtd中加入xlink支持的例子，如下：
<!ELEMENT novel (title, author, year)>
<!ATTLIST novel xmlns:xlink CDATA #FIXED 'http://www.w3.org/1999/xlink' xlink:type (simple) #FIXED 'simple' xlink:href CDATA #REQUIRED>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT year (#PCDATA)>
<!ENTITY % simplelink "xlink:type (simple) #FIXED 'simple' xlink:href CDATA #REQUIRED xmlns:xlink CDATA #FIXED 'http://www.w3.org/1999/xlink' xlink:role CDATA #IMPLIED xlink:title CDATA #IMPLIED xlink:actuate (onRequest | onLoad | other | none) 'onRequest' xlink:show (new | replace | embed | other | none) 'new'">
<!ATTLIST anthology %simplelink;>
<!ATTLIST novel %simplelink;>
<!ATTLIST nonfiction %simplelink;>
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