公共元数据(Common Meta Data)

作者： 地狱男爵

1. Common Meta Data

定义Compass配置文件(*.cfg.xml). Compass 自动替换OSEM对应的原数据(Common meta-data)标签的值. ${...} 很像ant.
简单的可以理解为alias对应为表,meta-data为column.具体阐述,请见compass reference(Chapter 3. Search Engine)，不过，因为annotation 比xml简单的多，此文件将慢慢消失。

<compass-core-meta-data>  
 <meta-data-group id="springside" displayName="SpringSide Book Meta Data">

  <description>SpringSide Meta Data</description>

  <uri>http://compass/springside</uri>  
 <alias id="book" displayName="Book">

  <description>Book alias</description>

  <uri>http://compass/springside/alias/book</uri>

  <name>book</name>

  </alias>  
 <meta-data id="name" displayName="Name">

  <uri>http://compass/springside/name</uri>

  <name>descn</name>

  </meta-data>  
 <meta-data id="descn" displayName="Description">

  <uri>http://compass/springside/descn</uri>

  <name>descn</name>

  </meta-data>  
 <meta-data id="author" displayName="Author">

  <description>The author of a book</description>

  <uri>http://compass/springside/author</uri>

  <name>author</name>

  </meta-data>  
 <meta-data id="publisher" displayName="Publisher">

  <description>The publisher of a book</description>

  <uri>http://compass/springside/publisher</uri>

  <name>publisher</name>

  </meta-data>

  </meta-data-group>  
</compass-core-meta-data>