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It's added in JBossEjbParsingDeployer

if (this.isPreEJB3x(ejbJarMetaData, jbossMetaData))

         {

            JBossMetaData stdMetaData = getStandardMetaData();

            if(stdMetaData != null)

               unit.addAttachment("standardjboss.xml", stdMetaData);

         }

and then StandardJBossMetaDataDeployer does the following

public void deploy(DeploymentUnit unit)
      throws DeploymentException
   {
      // Get the jboss.xml attachment
      JBossMetaData metaData = unit.getAttachment(JBossMetaData.class);
      // Get the standardjboss.xml attachment
      JBossMetaData stdMetaData = unit.getAttachment("standardjboss.xml", JBossMetaData.class);
      if(metaData == null || stdMetaData == null)
         return;

      JBossMetaDataWrapper wrapper = new JBossMetaDataWrapper(metaData, stdMetaData);
      // Set the wrapper as the output
      unit.getTransientManagedObjects().addAttachment(JBossMetaData.class, wrapper);
      // Keep the raw parsed metadata as well
      unit.addAttachment(RAW_ATTACHMENT_NAME, metaData, JBossMetaData.class);
   }