新手使用ibatis：ibatis Element type "select" must be declared.
这几天刚接触ibatis，就遇到这个错误，找了半天都不知道错在什么地方，求各位英雄帮忙解决！
java code：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sqlMap
  PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN"
  "http://ibatis.apache.org/dtd/sql-map-2.dtd">
  <sqlMap>
  <typeAlias alias="Student" type="com.ibatis.Student"/>
  <select id="selectAllStudent" resultClass="Student">
  select * from student
  </select>
  <select id="selectStudentById" resultClass="Student" parameterClass="int">
  select * from student where id=#id#
  </select>
  </sqlMap>
报错：

java.lang.ExceptionInInitializerError
Caused by: java.lang.RuntimeException: Error occurred. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/sqlMap'. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: org.xml.sax.SAXParseException: Element type "select" must be declared.
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:49)
at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:63)
at com.ibatis.StudentDaoImpl.<clinit>(StudentDaoImpl.java:18)
Caused by: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/sqlMap'. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: org.xml.sax.SAXParseException: Element type "select" must be declared.
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:53)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:46)
... 2 more
Caused by: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/sqlMap'. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: org.xml.sax.SAXParseException: Element type "select" must be declared.
at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:123)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:84)
at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:72)
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:51)
... 3 more
Caused by: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: org.xml.sax.SAXParseException: Element type "select" must be declared.
at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:53)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapParser.parse(SqlMapParser.java:40)
at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$10.process(SqlMapConfigParser.java:270)
at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:121)
... 7 more
Caused by: org.xml.sax.SAXParseException: Element type "select" must be declared.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:131)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:384)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:318)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1929)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.sta