转自http://hi.baidu.com/2wiki/blog/item/2cc40a3f2b7ef2c97c1e7127.html
DTD 类型约束文件
    1. Window->Preferences->XML->XML Catalog->User Specified Entries窗口中,选择Add 按纽
       
    2.在Add XML Catalog Entry 对话框中选择或输入以下内容:
        Location: F:\soft\programmingSoft\Framework\Ibatis\sql-map-config-2.dtd
        Key Type: URI
        KEY: http://ibatis.apache.org/dtd/sql-map-config-2.dtd
       
XSD 类型约束文件

    1. Window->Preferences->XML->XML Catalog->User Specified Entries窗口中,选择Add 按纽
       
    2.在Add XML Catalog Entry 对话框中选择或输入以下内容:
        Location: F:\soft\programmingSoft\Framework\Spring\spring-framework-2.5.6.SEC01-with-dependencies\spring-framework-2.5.6.SEC01\dist\resources\spring-beans-2.5.xsd
        Key Type: Schema Location
        KEY: http://www.springframework.org/schema/beans/spring-beans-2.5.xsd