This class provides a simple way to get a long string into an attribute.
It implements Configurable, so its value can be set using a configure MoML
element. For example,
<pre>
<property name="x" class="ptolemy.moml.ConfigurableAttribute">
<configure source="url">xxx</configure>
</property>
</pre>
The value of this property, obtained via the value() method,
will be whatever text is contained by the referenced URL (which
is optional), followed by the text "xxx".
Steve Neuendorffer and Edward A. Lee
$Id: ConfigurableAttribute.java 70402 2014-10-23 00:52:20Z cxh $
Ptolemy II 1.0
Green (eal)
Green (janneck)