I use [Static Site Generator | Nikola](https://getnikola.com/). Each post has  a header like as follows:

    <!--
    .. title: Some interesting title
    .. slug: some-interesting-title
    .. date: 2017-01-25 06:32:15 UTC-03:00
    .. tags: tag1,tag2
    .. category: Enlaces
    .. link:
    .. description: bla, bla, bla
    .. type: text
    -->

My idea is create a file with tags (tag1, tag2, ... tagn), and to use  insert mode completion, whith CTRL-X and CTRL-I.
But I have no idea about how to set an included file for search to find in it.

Any ideas?