BlueXML developer Studio use three different kinds of files:

• an obl file which contains the model. It is a simple xmi file with all the data. An extract of an obl file is shown below:

<?xml version="1.0" encoding="UTF-8"?> 
<MMUseCase:Package xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" 
                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
                   xmlns:MMUseCase="http://MMUseCase" xmi:id="_TnQCYKb7Edyg0-Q2ek6f8g" name="crm">
  <packageSet xmi:id="_V_-0UKb7Edyg0-Q2ek6f8g" documentation="" name="com">
  <packageSet xmi:id="_XPZ00Kb7Edyg0-Q2ek6f8g" name="bluexml">
  <packageSet xmi:id="_YWL2sKb7Edyg0-Q2ek6f8g" name="sem">
  <packageSet xmi:id="_blBKMKb7Edyg0-Q2ek6f8g" name="crm">
  ...
  <classSet xmi:id="_nYP48KcBEdyjnooseSwyow" documentation="" name="Project"
                title="Projet" description="" associations="_-ww3gKcBEdyjnooseSwyow">
     <comments xmi:id="_mZTqccjtEdyC9JwX7EOdEA" stereotypes="_yXB5sKcMEdy1ioBnpUnfzA" value="{Projet},name"/>
     <metainfo xmi:id="_r8Zu4dWLEdy_g5UDd75T2w" value="VerticalTab" key="visual-component"/>
     <attributes xmi:id="_oOVMYKcBEdyjnooseSwyow" documentation="" name="startDate" typ="Date" 
                                                          title="Date de début" description=""/>
     <attributes xmi:id="_okis8KcBEdyjnooseSwyow" documentation="" name="endDate" typ="Date" 
                                                         title="Date de fin" description=""/>
     <attributes xmi:id="_oy_YoKcBEdyjnooseSwyow" documentation="" name="name" typ="String" 
                                                                 title="Nom" description="">
         <metainfo xmi:id="_bwh58NPaEdyjn5pDRsG5lg" value="True" key="required"/>
     </attributes>
     <attributes xmi:id="_pwPEAKcBEdyjnooseSwyow" documentation="" name="description" typ="String" 
                                                             title="Description" description="">
         <metainfo xmi:id="_zkw5IKcBEdyjnooseSwyow" value="30" key="textarea-cols"/>
         <metainfo xmi:id="_zkw5IacBEdyjnooseSwyow" value="5" key="textarea-rows"/>
     </attributes>
  </classSet>
  ....
  </packageSet>
</MMUseCase:Package>

If you double-click on an obl file in the navigator view, it will open the file in the main view:

• an obli file which contains the graphical representation of the model. This file is automatically linked to an obli file which means that a modification of the graphical representation will be automatically reflected on the real model (contained in the obl file). If you double-click on an obli file in the navigator view, it will open the file in the main view:

• a ref file allows to build an overall model. For example, if we want to create a portal which manages customer and accounting, we will need to create two different models. Then, we will create a ref file in which we specify the name of these models. The ref file is a XML file. You can build a ref by hand or use BlueXML Tools menu. This is an extract of a ref file:

 <?xml version="1.0" encoding="UTF-8"?>
  <files>
    <file src="GroupModel.obl"/>
    <file src="MyModel.obl"/>
  </files>