MAVEN 继承使用时出错点

父POM：

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

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0modelVersion>

  <groupId>com.iWangY.springtestgroupId>
  <artifactId>springparentartifactId>
  <packaging>pompackaging>
  <version>1.0-SNAPSHOTversion>
  <modules>
    <module>spring01-Iocmodule>
  modules>

  <name>springparentname>
  
  <url>http://www.example.comurl>

  <properties>
    <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    <maven.compiler.source>1.7maven.compiler.source>
    <maven.compiler.target>1.7maven.compiler.target>
    <spring-core.version>4.3.18.RELEASEspring-core.version>
    <junit.version>4.11junit.version>
  properties>

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>junitgroupId>
        <artifactId>junitartifactId>
        <version>${junit.version}version>
        <scope>testscope>
      dependency>

      
      <dependency>
        <groupId>org.springframeworkgroupId>
        <artifactId>spring-coreartifactId>
        <version>${spring-core.version}version>
      dependency>

    dependencies>
  dependencyManagement>

  <build>
    <pluginManagement>
      <plugins>
        
        <plugin>
          <artifactId>maven-clean-pluginartifactId>
          <version>3.1.0version>
        plugin>
        
        <plugin>
          <artifactId>maven-resources-pluginartifactId>
          <version>3.0.2version>
        plugin>
        <plugin>
          <artifactId>maven-compiler-pluginartifactId>
          <version>3.8.0version>
        plugin>
        <plugin>
          <artifactId>maven-surefire-pluginartifactId>
          <version>2.22.1version>
        plugin>
        <plugin>
          <artifactId>maven-jar-pluginartifactId>
          <version>3.0.2version>
        plugin>
        <plugin>
          <artifactId>maven-install-pluginartifactId>
          <version>2.5.2version>
        plugin>
        <plugin>
          <artifactId>maven-deploy-pluginartifactId>
          <version>2.8.2version>
        plugin>
        
        <plugin>
          <artifactId>maven-site-pluginartifactId>
          <version>3.7.1version>
        plugin>
        <plugin>
          <artifactId>maven-project-info-reports-pluginartifactId>
          <version>3.0.0version>
        plugin>
      plugins>
    pluginManagement>
  build>
project>

子POM：

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

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springparentartifactId>
        <groupId>com.iWangY.springtestgroupId>
        <version>1.0-SNAPSHOTversion>
        <relativePath>../../springparent/pom.xmlrelativePath>
    parent>
    <modelVersion>4.0.0modelVersion>

    <artifactId>spring-iocartifactId>

    <name>spring-iocname>
    
    <url>http://www.example.comurl>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <maven.compiler.source>1.7maven.compiler.source>
        <maven.compiler.target>1.7maven.compiler.target>
    properties>

    <dependencies>
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-coreartifactId>
        dependency>
    dependencies>

    <build>
        <pluginManagement>
            <plugins>
                
                <plugin>
                    <artifactId>maven-clean-pluginartifactId>
                    <version>3.1.0version>
                plugin>
                
                <plugin>
                    <artifactId>maven-resources-pluginartifactId>
                    <version>3.0.2version>
                plugin>
                <plugin>
                    <artifactId>maven-compiler-pluginartifactId>
                    <version>3.8.0version>
                plugin>
                <plugin>
                    <artifactId>maven-surefire-pluginartifactId>
                    <version>2.22.1version>
                plugin>
                <plugin>
                    <artifactId>maven-jar-pluginartifactId>
                    <version>3.0.2version>
                plugin>
                <plugin>
                    <artifactId>maven-install-pluginartifactId>
                    <version>2.5.2version>
                plugin>
                <plugin>
                    <artifactId>maven-deploy-pluginartifactId>
                    <version>2.8.2version>
                plugin>
                
                <plugin>
                    <artifactId>maven-site-pluginartifactId>
                    <version>3.7.1version>
                plugin>
                <plugin>
                    <artifactId>maven-project-info-reports-pluginartifactId>
                    <version>3.0.0version>
                plugin>
            plugins>
        pluginManagement>
    build>
project>

以上是一个完整的MAVEN 继承的实例。

出错点：

父POM的节点外要用套一下。（在项目建立时，就犯了这个错误，在IDEA中看子项目的继承一直显示无法继承。）