schema2example: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/schema2example - from package: libxml-compile-perl

You may install the required package with command apt-get install {package}

Error in other languages:
schema2example: bevel nie gevind nie
schema2example: comandă negăsită
schema2example: comando não encontrado
schema2example: commande introuvable
schema2example: command not found
schema2example: käsku ei ole
schema2example: không tìm thấy lệnh
schema2example: komanda nerasta
schema2example: Kommando nicht gefunden.
schema2example: kommandot finns inte
schema2example: komut yok
schema2example: nie znaleziono polecenia
schema2example: níor aimsíodh an t-ordú
schema2example: no se encontró la orden
schema2example: no s'ha trobat l'ordre
schema2example: opdracht niet gevonden
schema2example: parancs nem található
schema2example: perintah tidak ditemukan
schema2example: príkaz nenájdený
schema2example: příkaz nenalezen
schema2example: команда не найдена
schema2example: командата не е открита
schema2example: 命令找不到
schema2example: コマンドが見つかりません