the key name of a tag . type : string default : none valid values : a-z , a-z , 0-9 , space , '' . : / = + \ - @ '' constraints : each key can be 1-128 characters long . required : yes concode_field_sep String value concode_elem_sep String key concode_field_sep String getKey concode_elem_sep String getValue concode_elem_sep Tag withValue concode_elem_sep int hashCode concode_elem_sep void setValue concode_elem_sep boolean equals concode_elem_sep Tag clone concode_elem_sep String toString concode_elem_sep Tag withKey
void function ( String arg0 ) { this . key = arg0 ; }