Update index.md

_ja/index.md

@@ -10,16 +10,11 @@ udver: '2'
 
 * In Japanese there is no obvious word boundary. So we need a definition of words.
   As the word definition for universal dependency (UD), we adopt short-unit word
-  (SUW) [1]. SUW is also adopted to tokenize sentences in Balanced corpus of
-  contemporary written Japanese (BCCWJ) [2] containing more than 60,000 sentences
+  (SUW) by NINJAL [1,3]. SUW is also adopted to tokenize sentences in Balanced Corpus of
+  Contemporary Written Japanese (BCCWJ) [2] containing more than 50,000 sentences
   in various domains and it has been shown that the SUW definition covers various
   language phenomena in real texts.
 
-* Many SUWs correspond to a single English word but they tend to be shorter than
-  English counterparts. An example is "フランス 語" (French; French language).
-  For detailed definition please refer to [3] written in Japanese.
-
-* The automatic tokenization accuracy is more than 98% on in-domain data (BCCWJ) [4].
 
 ---
 
@@ -37,11 +32,6 @@ Language Resources and Evaluation Vol. 48 345-371, May 2014.
 小椋 秀樹, 小磯 花絵, 冨士池 優美, 宮内 佐夜香, 小西 光, and 原 裕,
 独立行政法人国立国語研究所, 2011.
 
-[4] Language Resource Addition: Dictionary or Corpus?,
-Shinsuke Mori and Graham Neubig,
-In Proceedings of the Nineth International Conference on Language Resources and Evaluation, pp. 1631-1636, 2014.
-
-
 <!-- **Instruction**: Describe the general rules for delimiting words (for example, based on whitespace and punctuation) and exceptions to these rules. Specify whether words with spaces and/or multiword tokens occur. Include links to further language-specific documentation if available.-->
 
 ---
@@ -50,7 +40,18 @@ In Proceedings of the Nineth International Conference on Language Resources and
 
 ### Tags
 
-* to be described.
+The UD PoS tags in Japanese are converted from UniDic PoS tagset.
+
+The UniDic defines two layered PoS tagsets, one for Short Unit Words and the other for Long Unit Words.
+The PoS tagset for Short Unit Words is a 'lexicon-based label'(語彙主義) tagset in which PoS labels imply all possible usages in a context.
+In contrast, BCCWJ annotates the 'usage' of PoS as other PoS information.
+The PoS tagset for Long Unit Words uses 'usage-based labels'(用法主義) disambiguated by contextual information.
+[(小椋ほか 2010a)](http://pj.ninjal.ac.jp/corpus_center/bccwj/doc/report/JC-D-10-05-01.pdf) 
+[(小椋ほか 2010b)](http://pj.ninjal.ac.jp/corpus_center/bccwj/doc/report/JC-D-10-05-02.pdf)
+Note that , the term 'usage-based' here does not mean the same as in Langacker's Usage-Based model. 
+
+- The English Translation of POS Tagset by Dr. Irena Srdanovic
+[link](https://gist.github.com/masayu-a/e3eee0637c07d4019ec9)
 
 ---
 <!-- **Instruction**: Specify any unused tags. Explain what words are tagged as PART. Describe how the AUX-VERB and DET-PRON distinctions are drawn, and specify whether there are (de)verbal forms tagged as ADJ, ADV or NOUN. Include links to language-specific tag definitions if any.-->
@@ -68,7 +69,24 @@ In Proceedings of the Nineth International Conference on Language Resources and
 
 ## Syntax
 
-* to be described.
+Japanese syntactic dependency has the following properties.
+
+* Strictly Head Final:
+Bunsetsu-based dependencies in Japanese are strictly head final except for apposition and anastrophe (倒置).
+
+* Projective:
+Bunsetsu-based dependencies in Japanese are projective except for apposition and non-constituent conjunct coordinations (部分並列).
+
+* Arrow from modifier to head:
+In Japanese the NLP community, we depict the dependency arrows from modifier to head.
+This is opposite from the standard elsewhere in the world.
+
+We have several annotation schema for dependency annotation.  They are labelled but contain very limited syntactic information.
+Some syntactic labels in UD are in case frame or semantic role annotation in and are only available in Japanese (see next section).
+
+* Conversion from BCCWJ-DepPara schema:
+
+The BCCWJ-DepPara schema is two-sided: bunsetsu-based dependency using four labels: D for normal dependency, F for filler or no head or face mark, Z for sentence boundary in nested sentences, B for resolution of discrepancy between bunsetsu units; and nested coordination structure and apposition annotation, as in '[Coordination Annotation for the Penn Treebank](https://catalog.ldc.upenn.edu/LDC2015T08)'.
 
 ---
 <!-- **Instruction**: Give criteria for identifying core arguments (subjects and objects), and describe the range of copula constructions in nonverbal clauses. List all subtype relations used. Include links to language-specific relations definitions if any. -->