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<B> Next: <A NAME="tex2html108"
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<H1><A NAME="SECTION00090000000000000000">
9 Using ids</A>
</H1>
The file owner syntax explained in the previous sections is just a
special case of a more general way of referring to objects by id.  An
id is just a name internally used to refer to objects; it's never
displayed to the user, but it can be used internally in a gsmarkup
file to refer to an object: when a gsmarkup file is loaded, objects in
the file (or outside the file) can have an id set, and can be referred
to by using the special syntax <TT>#id</TT>.  The file owner is a
special case of this; it is an object (external to the file) which has
its id automatically set to <TT>NSOwner</TT>, so that you can refer to
it using <TT>#NSOwner</TT>.

<P>
To set the id of an object inside that file, you just add an
<TT>id</TT> attribute.  For example, <TT>&lt;window id="Foo" /&gt;</TT>
creates a window with an id of <TT>Foo</TT>.

<P>
To refer to the window, you can use the syntax <TT>#Foo</TT>;
<TT>#Foo</TT> means ``the object whose id is <TT>Foo</TT>''.  For example,
<TT>&lt;button target="#Foo" /&gt;</TT> creates a button, and sets its target 
to be the object whose id is <TT>Foo</TT>, that is, the window.

<P>
As a more complete example, the following gsmarkup file creates a
window, and inside the window a button; clicking on the button will
call the <TT>performClose:</TT> method of the window (which closes the
window):
<PRE>
&lt;gsmarkup&gt;

  &lt;objects&gt;

    &lt;window id="A"&gt;
      &lt;button title="Close window" action="performClose:" target="#A" /&gt;
    &lt;/window&gt;

  &lt;/objects&gt;

&lt;/gsmarkup&gt;
</PRE>
Here the window has an id of <TT>A</TT>, and the button target is set
to be the object with id <TT>A</TT>, which is the window.  You can try
out this example by replacing the Window.gsmarkup file in our example
with this one.

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<ADDRESS>
Nicola
2003-01-31
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