class_docstr: Article source for articles in arxmliv format:
  1) articles = directories starting with '#'
  2) content is stored in tex.xml
  3) metadata in special tags within tex.xml
  
  Article URI is currently (a part of) the article's path on filesystem.
  
  See the ArticleSource class for general info on sources.
class_docstr_tok: ["Article","source","for","articles","in","arxmliv","format",":","1",")","articles","=","directories","starting","with","'","#","'","2",")","content","is","stored","in","tex.xml","3",")","metadata","in","special","tags","within","tex.xml","Article","URI","is","currently","(","a","part","of",")","the","article","'s","path","on","filesystem",".","See","the","ArticleSource","class","for","general","info","on","sources","."]
docstr: Parse tokens out of xml. There are two types of token: normal text and
  mathematics. Both are returned interspersed in a single list, in the same
  order as they appeared in the content.
  
  The math tokens will be returned in the form $tex_expression$, ie. with
  a dollar sign prefix and suffix.
code: def tokenize(self, content):
      """
      Parse tokens out of xml. There are two types of token: normal text and
      mathematics. Both are returned interspersed in a single list, in the same
      order as they appeared in the content.
  
      The math tokens will be returned in the form $tex_expression$, ie. with
      a dollar sign prefix and suffix.
      """
      handler = ArxmlivSource.ArxmlivContentHandler()
      xml.sax.parseString(
          content, handler, ArxmlivSource.ArxmlivErrorHandler()
      )
      return handler.tokens
  
imports: import logging
  import os
  import os.path
  import re
  import xml.sax
  from gensim import utils
  import sys
label_desc: Use image node_id 8 for calling the ArxmlivSource obj's underlying member method code with example usage: obj.tokenize(content) and returns: handler