Welcome to GATE's Syntax Tree Browser/Editor Demo!
This demo requires a Web browser supporting Java 2 or one
with a Java 2 Plug-in installed. If you
experience any problems, please consult your system administrator.
For an explanation and help see below.
What is the Syntax Tree Browser/Editor?
This applet demonstrates some of the functionality of
GATE2 Syntax Tree Browser/Editor (STB/E). This browser similar to all other
GATE2 viewers has been implemented in Java 2 using Swing user interface
components. Since it is also a Java Bean, it can be integrated flexibly
in any Java application, applet or as a part of a custom-built viewer.
The input and the output are annotations compliant with GATE2 Java Document
STB/E has the following functionality:
- display of an utterance to be annotated
- display of a partially-annotated utterance
- display of one or more syntax trees built on one utterance.
That is, the
viewer always deals with one utterance which can in turn consist of one or more
sentences which get annotated fully or partially.
Annotating (Parts of) an Utterance
The annotation proceeds from bottom to top, where first each word can be assigned
an appropriate tag. To do that, select a word by clicking on it and then right-click
it to see the menu with available categories. Select the most appropriate category.
To combine non-terminal category nodes into higher-level non-terminals
(e.g. DET and N into a NP), select all non-terminal nodes for the category by
clicking each one of them and also holding the CTRL key for multiple selection.
Then right-click to display the category menu and select the most appropriate
To delete a wrongly annotated non-terminal node, select it and then press
the DEL key.
To view all new annotations you just added, click the Show Annotations button
and it will display in the near-by field a list of all annotations in their
span and attribute format. For an explanation of spans, attributes and annotations
see GATE2 Document Manager pages and the TIPSTER specification.
Note that the next time you view the new annotations, those previously added will
not be displayed.
Customising the Available Categories
The given list of available categories is just for demo purposes. The categories
can be specified programmatically and could differ from one application to another.
This functionality is supplied by the GATE2 Document Manager.