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https://github.com/proycon/flat

FoLiA Linguistic Annotation Tool -- Flat is a web-based linguistic annotation environment based around the FoLiA format (http://proycon.github.io/folia), a rich XML-based format for linguistic annotation. Flat allows users to view annotated FoLiA documents and enrich these documents with new annotations, a wide variety of linguistic annotation types is supported through the FoLiA paradigm.
https://github.com/proycon/flat

annotation-tool clariah clarin computational-linguistics folia javascript linguistic-annotation-framework linguistics nlp python web-application

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FoLiA Linguistic Annotation Tool -- Flat is a web-based linguistic annotation environment based around the FoLiA format (http://proycon.github.io/folia), a rich XML-based format for linguistic annotation. Flat allows users to view annotated FoLiA documents and enrich these documents with new annotations, a wide variety of linguistic annotation types is supported through the FoLiA paradigm.

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	:target: http://flat.readthedocs.io/en/latest/?badge=latest

	:alt: Documentation Status



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*****************************************

FLAT - FoLiA Linguistic Annotation Tool

*****************************************



FLAT is a web-based linguistic annotation environment based around the FoLiA

format (http://proycon.github.io/folia), a rich XML-based format for linguistic

annotation. FLAT allows users to view annotated FoLiA documents and enrich

these documents with new annotations, a wide variety of linguistic annotation

types is supported through the FoLiA paradigm. It is a document-centric tool

that fully preserves and visualises document structure.



FLAT is written in javascript with jquery on a backend of Python using the Django framework.  The FoLiA Document Server

(https://github.com/proycon/foliadocserve) , the back-end of the system, is written in Python with CherryPy and is used

as a RESTful webservice.



FLAT is open source software developed at the Centre of Language and Speech

Technology, Radboud University Nijmegen. It is licensed under the GNU Public

License v3. The project is funded in the scope of the larger `CLARIAH

`_ project.



=============================================

Features

=============================================



* Web-based, multi-user environment

* Server-side document storage, divided into 'namespaces', by default each user

  has his own namespace. Active documents are held in memory server-side.

  Read and write permissions to access namespaces are fully configurable.

* Concurrency (multiple users may edit the same document similtaneously)

* Full versioning control for documents (using git), allowing limitless undo operations. (in foliadocserve)

* Full provenance information, including annotator names and timestamps, is stored in the FoLiA XML and can be displayed by the interface. The git log also contains verbose information on annotations.

* Annotators can indicate their confidence for each annotation

* Highly configurable interface; interface options may be disabled on a

  per-configuration basis. Multiple configurations can be deployed on a single

  installation

* Displays and retains document structure (divisions, paragraphs, sentence, lists, etc)

* Support for corrections, of text or linguistic annotations, and alternative annotations. Corrections are never mere substitutes, originals are always preserved!

* Spelling corrections for runons, splits, insertions and deletions are supported.

* Supports FoLiA Set Definitions to display label sets. Sets are not predefined

  in FoLiA and anybody can create their own.

* Supports Token Annotation and Span Annotation

* Supports complex span annotations such as dependency relations, syntactic units (constituents), predicates and semantic roles, sentiments, stratements/attribution, observations

* Simple metadata editor for editing/adding arbitrary metadata to a document.

  Selected metadata fields can be shown in the document index as well.

* User permission model featuring groups, group namespaces, and assignable permissions

* File/document management functions (copying, moving, deleting)

* Allows converter extensions to convert from other formats to FoLiA on upload

* In-document search (CQL or FQL), advanced searches can be predefined by administrators

* Morphosyntactic tree visualisation (constituency parses and morphemes)

* Higher-order annotation: associate features, comments, descriptions with any

  linguistic annotation, also allow for arbritary relations between any type of annotation or structure



============================================

Architecture

============================================



The FLAT architecture consists of three layers:



* The **FoLiA Document Server** (https://github.com/proycon/foliadocserve)

* The **FLAT server**

* The **user-interface**



At the far back-end is the FoLiA Document Server, which loads the requested

FoLiA documents, and passes these as JSON and HTML to the middle layer, the

FLAT server, this layer in turn passes edits formulated in FoLiA Query Language

(FQL) to the Document Server. The user-interface is a modern web-application

interacting with the FLAT server and translates interface actions to FQL.



FLAT distinguishes several **modes**, between which the user can switch to get

another take of a document with different editing abilities. There are

currently three modes available, and a fourth one under construction:



* **Viewer** - Views a document and its annotations, no editing abilities

* **Editor** - Main editing environment for linguistic annotation

* **Metadata editor** - A simple editor for document-wide metadata

* **Structure Editor** - Editing environment for document structure *(rudimentary version, not done)*



In the viewer and editor mode, users may set an **annotation focus**, i.e. an

annotation type that they want to visualise or edit. All instances of that

annotation type will be coloured in the interface and offer a *global* overview.

Moreover, the editor dialog will automatically present fields for editing that

type whenever a structure element (usually a word/token) is clicked.



Whereas the annotation focus is primary, users may select what other annotation

types they want to view *locally*,  i.e. in the annotation viewer that

pops up whenever the user hovers over a structural element. Similarly, users

may select what annotation types they want to see in editor, allowing the

editing of multiple annotation types at once rather than just the annotation

focus.



FoLiA distinguishes itself from some other annotation formats by explicitly

providing support for **corrections** (on any annotation type, including text)

and **alternative annotations**. In FLAT these are categorized as **edit

forms**, as they are different forms of editing; the user can select which form

he wants to use when performing an annotation.



The site administrator can configure in great detail what options the user has

available and what defaults are selected (for annotation focus for instance),

as a full unconstrained environment (which is the default) may quickly be

daunting and confusing to the end-user. Different tasks ask for different

configurations, so multiple configurations per site are

possible; the user chooses the desired configuration, often tied to a

particular annotation project, upon login.



===========================================

Documentation

===========================================



FLAT Documentation can be found in the form of the following three guides:



* `Installation Guide `_. - Explains how to install FLAT.

* `Administration Guide `_. - Explains how to configure FLAT for your annotation task.

* `User Guide `_. - Explains how to use FLAT.



Moreover, a screencast video has been created to show FLAT in action and

offer an impression of its features:



* `FLAT Demonstration Video `_.



=============================================

Screenshots

=============================================



For some impressions of FLAT, take a look at the following screenshots:



The login screen:



.. image:: https://raw.github.com/proycon/flat/master/docs/login.png

    :alt: FLAT screenshot

    :align: center



Document index, showing namespaces accessible to the user and the documents

within.



.. image:: https://raw.github.com/proycon/flat/master/docs/mydocuments.png

    :alt: FLAT screenshot

    :align: center



Hovering over words reveals annotations:



.. image:: https://raw.github.com/proycon/flat/master/docs/hover.png

    :alt: FLAT screenshot

    :align: center



A particular annotation focus can be set to highlight the most frequent

classes in that set:



.. image:: https://raw.github.com/proycon/flat/master/docs/highlight1.png

    :alt: FLAT screenshot

    :align: center



.. image:: https://raw.github.com/proycon/flat/master/docs/highlight2.png

    :alt: FLAT screenshot

    :align: center



Editing a named entity in a set for which a set definition is available:



.. image:: https://raw.github.com/proycon/flat/master/docs/edit2.png

    :alt: FLAT screenshot

    :align: center



Correcting a word in a spelling-annotation project:



.. image:: https://raw.github.com/proycon/flat/master/docs/edit1.png

    :alt: FLAT screenshot

    :align: center



Proper right-to-left support for languages such as Arabic, Farsi and Hebrew.



.. image:: https://raw.github.com/proycon/flat/master/docs/righttoleft.png

    :alt: FLAT screenshot (right to left)

    :align: center



Extensive history with limitless undo ability, git-based:



.. image:: https://raw.github.com/proycon/flat/master/docs/history.png

    :alt: FLAT screenshot

    :align: center



Advanced search queries in CQL (Corpus Query Language) or FQL (FoLiA Query Language):



.. image:: https://raw.github.com/proycon/flat/master/docs/searchcql.png

    :alt: FLAT screenshot

    :align: center



.. image:: https://raw.github.com/proycon/flat/master/docs/search.png

    :alt: FLAT screenshot

    :align: center



Tree visualisation of syntax and morphology:



.. image:: https://raw.github.com/proycon/flat/master/docs/syntree.png

    :alt: FLAT screenshot

    :align: center



.. image:: https://raw.github.com/proycon/flat/master/docs/morphtree.png

    :alt: FLAT screenshot

    :align: center