das: added operator "validate" to perform variable value checking
das: added operator "validate" to perform variable value checking
loentar/staff,loentar/staff,google-code-export/staff,gale320/staff,google-code-export/staff,gale320/staff,loentar/staff,loentar/staff,gale320/staff,loentar/staff,loentar/staff,google-code-export/staff,gale320/staff,google-code-export/staff,gale320/staff,google-code-export/staff,gale320/staff,google-code-export/staff