I have a typical pom.xml, and want to print the groupId, artifactId and version, separated by colon. I think that XMLStarlet is the right tool for that. I tried several ways, but I always get an empty line.

xml sel -t -m project -v groupId -o : -v artifactId -o : -v version pom.xml

Expected output: 

org.something.apps:app-acct:5.4

Real output: empty line

Even if I try to print just the groupId I get nothing:

xml sel -t -v project/groupId pom.xml

I am sure that the tool sees the elements because I can list them without problem:

xml el pom.xml

prints the following (correctly):

project
project/modelVersion
project/parent
project/parent/groupId
project/parent/artifactId
project/parent/version
project/groupId
project/artifactId
project/version
project/packaging

What's wrong?

Here is the cut-down version of pom.xml:

<?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/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.something</groupId>
        <artifactId>base</artifactId>
        <version>1.16</version>
    </parent>

    <groupId>org.something.apps</groupId>
    <artifactId>app-acct</artifactId>
    <version>5.4</version>
    <packaging>war</packaging>

</project>
command-line-interface pom.xml xmlstarlet
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