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[request] Option to ignore root <project> tag formatting

See original GitHub issue

First of all: amazing plugin. Great job 👍

We have a rather large project with about 250 POMs and 100 developers.

While this plugin works very well, one thing that is preventing me from using it is the fact that there is no option to disable formatting of the root <project> tag.

We format our tag as:

<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">

When running the sortpom:sort goal, all 250 POMs are changed to:

<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">

Which is very annoying to have to revert.

We would love it if this behavior is disabled, or controllable through a configuration option.

My settings:

<plugin>
    <groupId>com.github.ekryd.sortpom</groupId>
    <artifactId>sortpom-maven-plugin</artifactId>
    <version>2.12.0</version>
    <configuration>
        <createBackupFile>false</createBackupFile>
        <keepBlankLines>true</keepBlankLines>
        <sortDependencies>scope,groupId,artifactId</sortDependencies>
        <nrOfIndentSpace>4</nrOfIndentSpace>
        <expandEmptyElements>false</expandEmptyElements>
        <spaceBeforeCloseEmptyElement>false</spaceBeforeCloseEmptyElement>
    </configuration>
</plugin>