The alignment template translation model (Och and Ney 2004)

The alignment template translation model (Och and Ney 2004) and related phrase-based models advance
The alignment template translation model (Och and Ney 2004) and related phrase-based
models advanced the state of the art in machine translation by expanding the basic
unit of translation from words to phrases,that is,substrings of potentially unlimited
size (but not necessarily phrases in any syntactic theory).我想问的是括号里面的内容的意思？Och and Ney 2004是指och与ney于2004年出版的书么？
but not necessarily phrases in any syntactic theory是指不在任何语法理论里面的不必要短语？