* Merge same characters of different dictionaries in search output.
* Transformation of reading search pattern, e.g. ka > か, か > カ, か > ka
  should be language independent.
* Implement advanced searching.
* Modulized dictionary types.
  - XML
  - Hyper Estraier
  - QDBM?
  - MySQL?
  - CHISE?
* Add radicals and variant element into tomoe-dict.dtd.
* Asynchronous dictionary loading?
* Asynchronous searching?
* Prepare character data base.
* HMM! HMM!
* Write document.
