Version Control With Subversion Source

To resolve this issue, I reference [1].

Font files, simsun.ttc and DroidSansFallbackFull.ttf are copied from
Windows XP (C:\WINDOWS\Fonts\simsun.ttc) and Ubuntu 14.04.6
(/usr/share/fonts/truetype/droid/DroidSansFallbackFull.ttf), respectively.
I believe these two fonts are free to use.

The pdf isn't perfect yet and need more tuning.

[1] https://blog.easwy.com/archives/render_docbook_xml_to_pdf_by_apache_fop/