Based partly on this evidence , a controversial recent paper by farmer , sproat , and witzel ( 2004 ) , argues that the indus system did not encode language , but was related instead to a variety of non - linguistic sign systems used extensively in the near east 基于这种证据，一篇有争议性的论文最近由法玛、斯波特和韦兹尔（ 2004 ）发表了，争论说印度体系并没有编码的语言，而是广泛地使用近东的各种非语言符号系统。
