If there is no ready-to-use one for your purpose, one option would be to quickly write an HTML page to embed multiple TextAE editors: http://textae.pubannotation.org/docs/embed/
TextAE is a text annotation tool which can be embedded in any HTML document.
What I suggest is to write an HTML page to embed two TextAE editors, so that you can see and annotate two documents at the same time in one HTML page. Below is a link to a page in PubAnnotation which embeds two TextAE instances: http://pubannotation.org/docs/sourcedb/PubMed/sourceid/10024668/spans/150-372/annotations/visualize?projects=bionlp-st-gro-2013-development,GlycoBiology-FMA
Although the page is in the "view" mode, and annotations cannot be edited, it is easy to change it to the "edit' mode to edit the annotations.
Hope it helps.
On Wed, May 3, 2017 at 10:22 PM, Dominique Brunato
<dominique.brunato at ilc.cnr.it> wrote:
> Dear Irina,
> actually, I used Brat to carry out an annotation task which seems quite
> similar to that you are describing. In our case, too, we had two different
> versions of the same document (say, one "original" and one "trasformed") and
> we annotated the edited span(s) on the original text according to the labels
> set in the annotation configuration files. To do this, you just need to
> create a single txt file composed by the two versions of the same document,
> so that when you open the file in the tool you can visualize (an possibly
> annotate) both versions together; you can divide them by leaving a blank
> line or also prefixing each one using some xml tags.
> I hope this would help you.
> Irina Temnikova <irina.temnikova at gmail.com> ha scritto:
>> Dear all,
>> we are looking for an annotation tool with which we can annotate two
>> documents in parallel.
>> Both documents must be visible in the same time, so the annotators can
>> compare them & both must be in the same time open for annotation.
>> Let's say that one document is a transformation of the other, and we want
>> know what is missing in one and appearing in the other and vice versa.
>> Our annotators are linguists, with not much expertise in Computer Science,
>> so the tool should be easy to use.
>> We don't think GATE or Brat support this.
>> Thank you very much in advance,
>> *Irina P. Temnikova, B.A., M.A., Ph.D.*
>> *Postdoctoral Researcher*
>> Arabic Language Technologies Research Group
>> Qatar Computing Research Institute
>> Hamad Bin Khalifa university (HBKU)
>> The Research and Development Complex (RDC)
>> P.O. Box 5825
>> Doha, Qatar
>> Mob: +974 33320188 <+974%203332%200188>
>> Tel: +974 ...
>> *If you want to build a ship, don't drum up the men to gather wood, divide
>> the work and give orders. Instead, teach them to yearn for the vast and
>> endless sea. (Antoine de Saint-Exupery)*
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