class tag
   {
   string name;      // Just the name, no attributes
   dir of string attributes;  // All the var=value pairs
   int startPos;     // Start position within XML 
   int endPos;       // End position within XML
   }

flow parseTagContents(string contents) 
into (string name, dir of string attributes)
   {
   // Parse out name, and set pos to the end of the name
   int pos = contents.leadingSpaces();  // Space after < is ok
   int endName = contents.findNext(' ', pos);
   if (endName < 0) // All just one word
      endName = contents.size;
   name = contents.middle(pos, endName-pos);
   pos = endName;

   // Create attributes dir, and loop to fill it up.
   attributes = ();
   for (;;)
      {
      // Skip over leading white space and see if we're done.
      pos += contents.leadingSpaces(pos);
      if (pos >= contents.size)
          break;

      // Find the equals and save away the word before it.
      int equalsPos = contents.findNext('=', pos);
      if (equalsPos < 0)
          punt("Missing = in $contents");
      string var = contents.middle(pos, equalsPos-pos);
      pos = equalsPos+1;

      // Find the quoted string and save it
      pos = contents.findNext('"', pos);
      if (pos<0)
          punt("Missing quote after = in $contents");
      pos += 1;  // Skip over "
      int endQuote = contents.findNext('"', pos);
      if (pos<0)
          punt("Missing closing quote in $contents");
      string val = contents.middle(pos, endQuote-pos);
      attributes[var] = val;
      pos = endQuote+1;  // Skip over end quote
      }
}

flow parseNextTag(string xml, int pos) 
into (tag tag, int nextPos)
    {
    int startPos = xml.findNext('<', pos);
    if (startPos < 0)
        return;
    startPos += 1;	// skip over '<'
    int endPos = xml.findNext('>', startPos);
    if (endPos < 0)
        punt("Unmatched '<'");
    tag = ();
    tag.startPos = startPos;
    tag.endPos = endPos;
    string contents = xml.middle(startPos, endPos-startPos);
    (tag.name, tag.attributes) = parseTagContents(contents);
    nextPos = endPos+1;  // skip over '>'
    }

string xml = fileReadAll(args[0]);
int pos = 0, tag tag;
for (;;)
    {
    (tag, pos) = parseNextTag(xml, pos);
    if (!tag)
        break;
    print(tag);
    }