xsdtree: 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/xsdtree - from package: xmlbeans

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

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