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<project>

<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/4.0.0http://maven.apache.org/maven-v4_0_0.xsd">

Keep more extended version of project, so you can visit the schema and validate document

<pomVersion>3.0.0</pomVersion>

<modelVersion>4.0.0</modelVersion>

Differentiates between different versions of POM objects

<groupId>

<groupId>

Stays the same

<artifactId>    

<artifactId>    

Stays the same

<currentVersion>

<version>

Same meaning

<shortDescription>

<description>

Same meaning

<package>

Not used, JavaDoc is done differently in Maven 2

The Java package name of the project. This value is used when generating JavaDoc.

<siteAddress>

Not used, hostname is part of the corresponding <url> element

The hostname of the web server that hosts the project's web site. This is used when the web site is deployed.

<siteDirectory>

  Not used, directory part of the corresponding  <url> element

The directory on the web server where the public web site for this project resides

<repository>

Should be nested inside <repositories> element

Specifies various Maven and SCM repositories

<developerConnection>

Should be moved to <scm> element

Defines connection to SCM (Source Control Management) for developers.  

<reports>

<reports> <reporting> (and <report>*)    Delete, it is deprecated in Maven 2.  

This element includes the specification of reports to be included in a Maven-generated site. 

<properties>

If used inside <dependency> delete the element and use <scope>, <version>,<type> as described in http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html

Dependency properties

<url> 

If used inside <dependency>, delete it.  

Different URLs nested inside other elements

<sourceDirectory>

<sourceDirectory>  

Used inside <build>, no need to specify, if the default src directory is used. 

<issueManagementUrl>

<issueManagement>

url of Jira server