您当前的位置： 首页 > 学无止境 > XML与XSLT 网站首页XML与XSLT

11.dtd的实体使用

发布时间：2017-04-30 12:53:03编辑：雪饮阅读（）

 1内部实体:

声明示例:声明内部实体变量shl与调用实体变量shl

<!ENTITY shl '广州传智播客教育有限公司'>

引用示例:

<school>&shl;</school>

内部实体完整示例：

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE students[

<!ELEMENT students (student+)>

<!ELEMENT student (name,age,school)>

<!ELEMENT name ANY>

<!ELEMENT age ANY>

<!ELEMENT school ANY>

<!ENTITY shl '广州传智播客教育有限公司'>

]>

 

<students>

         <student>

                   <name>tom</name>

                   <age>23</age>

                   <school>&shl;</school>

         </student>

</students>

 

2引入实体:

示例:声明引入实体变量info与调用引入实体变量info

<!ENTITY % info SYSTEM './14.dtd' >

%info;

引入实体完整示例：

（1）xml：

<?xml version="1.0" encoding="utf-8" standalone="no"?>

<!DOCTYPE students[

<!ELEMENT students (student+,student2)>

<!ENTITY % info SYSTEM './14.dtd' >

%info;

<!ENTITY shl '广州传智播客教育有限公司'>

]>

 

<students>

         <student>

                   <name>tom</name>

                   <age>23</age>

                   <school>&shl;</school>

         </student>

         <student2>

                   <name>tom</name>

                   <age>23</age>

                   <school>&shl;</school>

         </student2>

</students>

（2）被引入文件：

<!ENTITY % nas "(name,age,school)">

<!ELEMENT student (name,age,school)>

<!ELEMENT student2 %nas;>

<!ELEMENT name ANY>

<!ELEMENT age ANY>

<!ELEMENT school ANY>

 

3参数实体:

示例:参数实体只能在外部dtd中使用

<!ENTITY % nas "(name,age,school)">

<!ELEMENT student (name,age,school)>

<!ELEMENT student2 %nas;>

完整示例：参见引入实体完整示例中的dtd文件

4外部引入实体:

(1)dtd文件在本网站服务器内部

<!DOCTYPE 根节点名称 SYSTEM 'dtd_url'>

完整示例：

xml：

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE students SYSTEM './15.dtd'>

<students>

         <student>

                   <name>tom</name>

                   <age>23</age>

                   <school>xx</school>

         </student>

</students>

dtd：

<!ELEMENT students (student+)>

<!ELEMENT student (name,age,school)>

<!ELEMENT name ANY>

<!ELEMENT age ANY>

<!ELEMENT school ANY>

(2)dtd文件存在于外网

<!DOCTYPE 根节点名称 PUBLIC 自定义名称 外网dtdurl>

完整示例：

xml：

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE students PUBLIC 'xy' "http://www.xy.com/15.dtd">

<students>

         <student>

                   <name>tom</name>

                   <age>23</age>

                   <school>xx</school>

         </student>

</students>

dtd:

<!ELEMENT students (student+)>

<!ELEMENT student (name,age,school)>

<!ELEMENT name ANY>

<!ELEMENT age ANY>

<!ELEMENT school ANY>