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Multi Tier Annotation Search

See textexploration.github.io/mtas/ for more documentation and instructions.


A docker image providing a Solr based demonstration scenario with indexing and querying of some sample documents is available. To pull and run

docker pull textexploration/mtas
docker run -t -i -p 8080:80 --name mtas textexploration/mtas

Or to build and run

docker build -t mtas https://raw.githubusercontent.com/textexploration/mtas/master/docker/Dockerfile
docker run -t -i -p 8080:80 --name mtas mtas

This will provide a website on port 8080 on the ip of your docker host with more information.


This project builds upon the latest commit from April 30, 2018 for meertensinstituut/mtas. See also the related broker project, another continuation of previous work.


One of the primary use cases for Mtas, the Nederlab project, currently1 provides access, both in terms of metadata and annotated text, to over 74 million items for search and analysis as specified below.

Total Mean Min Max
Solr index size 2,715 G 60.3 G 75 k 288 G
Solr documents 74,762,559 1,661,390 119 11,912,415

Collections are added and updated regularly by adding new cores, replacing cores and/or merging new cores with existing ones. Currently, the data is divided over 44 separate cores. For 41,437,881 of these documents, annotated text varying in size from 1 to over 3.5 million words is included:

Total Mean Min Max
Words 18,494,454,357 446 1 3,537,883
Annotations 95,921,919,849 2,314 4 23,589,831

Mtas is also used on Middelnederlands.nl, including geographical selections and new analysis options.2

example document

Keyword in context

example kwic

Group results

example group

Geographic conditions

example geographic

Correlation analysis

example correlation

Geographical analysis

example map1

example map1


1 situation June 2018

2 release April 2020