5. Scheme Management

After you have segmented the text, you will need to provide a scheme (unless you specified an existing scheme when you loaded the text/codings). Click on the Scheme button on the top toolbar to change to the Scheme Management interface. You will be presented with something like the following.

Figure 3: The Scheme Interface with a new scheme

When importing the text file, the program asked you to specify a feature to describe all units you are coding. In this case, I specified 'clause'. You now have to enter a coding scheme, the heirarchical organisation of the features you wish to use to code your text. The system starts with a minimal 'dummy' scheme, which you have to modify and extend to make your scheme. Figure 4 shows a more extended scheme.

Figure 4: A more complex scheme

5.1 System networks

The Coder uses the heirarchy representation from Systemic Functional Linguistics. The heirarchy is called a system network. It consists of a number of inter-dependent choice points called systems. The dummy system shown in figure 3 is one such.

A system consists of three parts:

Several systems can have the same entry-condition, in which case, the systems are called simultaneous systems. They form a cross classification of the entry-condition. For instance, we might introduce another system with clause as entry-condition, which might have features finite and nonfinite.

The set of systems that you define form a system network, with the features of one system forming the entry conditions for more specific systems. How you can create these networks is described blow.

5.2 Creating & Modifying Systems

If you click on one of the feature (lower case) or the system (upper case) of the network, you will be presented with a popup menu of actions. These allow you to extend or modify the network.

5.2.1 Actions on Systems

5.2.2 Actions on Features

5.2.3 Changing Entry Conditions  [New]

To change the entry condition of a system, click on the system, and select "Change Entry Condition". You will be presented with a dialog box as in figure 5.

Figure 5: The Change Entry Condition Dialog: simple and complex

Simple Entry Condtion: If you want a simple entry condition (the system extends from a single feature), then set "Number of terms" to 1, then choose the feature you want as the entry condition. Press "OK" and the graph will be redrawn as specified. The Coder will automatically update the codings which are affected by the change.

Complex Entry CondtionYou can also introduce complex entry conditions into your network. A complex entry condition involves a conjunction ('and') or disjunction ('or') of features. Set the number of terms to 2 or higher. Then select the features you wish s the input. Note that at present, you cannot mix AND and OR in the same entry condition. You can simulate such by first making a 'gate' (a system with only one feature). For instance, to construct the entry condition 'A and (B or C)', first make a system with one feature (call the feature b-or-c). Then use this feature and the A feature in an AND entry condition for your original system. The entry condition for this system will now be 'A and (B or C)'.

5.2.4 To Move a feature to another system

If you want to move a feature from one system to another, click on the system you wish to add the feature to, and select "Add Feature". Then type in the name of the feature you wish to move. The feature will be moved to this system. All codings will be adjusted for the change.

5.3 Printing Schemes and Exporting for Inclusion in Documents [New]

To send your network to the printer, click on the "Print Scheme" button. Note that the printing is unreliable at present, and may truncate larger networks.

To save a postscript version of the network, which can be included in Latex documents (but maybe not in MS Word at present), click the "Save PS" button.

To save a version of the network in pdx format, click the "Save PDX" button (Scheme interface). This format is useable for PC users, and in conjunction with the MDraw program, allows inclusion of scheme diagrams in MS Word or other word processor documents. See the instructions for use in section 2.4.
NOTE: I haven't yet perfected the export of curly brackets to pdx. You may have to draw these yourself within MDraw.

For more details on printing and exporting your networks, see here