/**
     * Set the identifier of the POM in the format {@code
     * <groupId>:<artifactId>:<version>}.
     *
     * @param modelId
     */
    public void setModelId(String modelId) {
        this.modelId = modelId;
    } // -- void setModelId( String )

    /**
     * Get the location of the POM from which this POM was imported from.
     * Can return {@code null} if this POM was not imported.
     *