xmltrip: 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/xmltrip - from package: libxmlm-ocaml-dev

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

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