Here\'s a quick and dirty script to search Biblionet.gr with Tellico for ISBN values only. Download all 3 files into the same directory somewhere.

Create a new Data Source in Tellico of type External Application with these settings
- Source name: Biblionet
- Collection type: book collection
- Result type: tellico
- Path: /path/to/script/biblionet.sh
- Arguments:
* ISBN (checked) = %1

You may need to make sure that biblionet.sh and json2xml.py are executable. (chmod -x biblionet.sh json2xml.py)

Requires python, wget, and xsltproc