The conversion of a file to another file is the process of changing the form of the presentation of the data, and not the data itself. Every time, when data file is to be used, they must be converted to a readable format for the next application. A data conversion is normally an automated process to some extent. SPPAS provide the possibility to automatically import and export the work done on some various file formats from a wide range of other software tools. For the users, the visible change will be only a different file extension but for software it is the difference between understanding of the contents of the file and the inability to read it.
The conversion of file formats is then a difficult task and it can imply that some data are left. Representing annotated data in SPPAS is of crucial importance for its automatic annotations, its analysis of annotations and for the software to be able to automatically annotate and analyze any kind of data files. SPPAS then includes an original and generic enough annotation representation framework. This framework for annotations is very rich and contain several information like alternative labels or alternative localizations of annotations, a tier hierarchy, controlled vocabularies, etc. A native format named XRA was then developed to fit in such data representation. The physical level of representation of XRA obviously makes use of XML, XML-related standards and stand-off annotation. Due to an intuitive naming convention, XRA documents are human readable as far as possible within the limits of XML.
In the scope of the compatibility between SPPAS data and annotated data from other software tools or programs, SPPAS is able to open/save and import/export several file formats.
SPPAS makes use of its internal data representation to convert files. A conversion then consists of two steps:
These two steps are applied whatever the organization structure of annotations in the original or in the destination file format. This process allows SPPAS to import from and export to a variety of file formats. This is illustrated by the next Figure which includes the list of file formats and the corresponding software that are supported. Arrows are representing the following actions:
SPPAS supports the following software with their file extensions:
The followings can be imported:
The followings can be exported:
The support of external formats is regularly extended to new formats by the author on-demand from the users and distributed to the community in the SPPAS regular updates.
Convert of the GUI allows to convert checked files of the workspace into the selected format. A table is indicating which of the features are supported by each format. It allows to know what to expect when converting from one format to the other one. For example, a Praat TextGrid file does not contain metadata nor media information neither a controlled vocabulary nor a hierarchy. If the file to be converted contains such information, they’ll be lost in the TextGrid converted file.
bin/trsconvert.py allows to convert files with the CLI.