xsdvalidate: 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/xsdvalidate - from package: xmlbeans

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

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