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NAME

       xowish  - Graphical shell containing object-oriented scripting language
       XOTcl

SYNOPSIS

       xowish ?fileName arg arg ...?
_________________________________________________________________

DESCRIPTION

       xowish is a shell-like application that reads XOTcl commands  from  its
       standard  input  or  from  a  file  and  evaluates them. In addition to
       xotclsh it provides graphical user interface support for TK widgets.

       XOTcl (XOTcl, pronounced exotickle)  is  an  object-oriented  scripting
       language  based  on  MIT's  OTcl.  It  is  intended  as  a  value added
       replacement for OTcl.

       Scripting languages, like Tcl,  are  designed  for  glueing  components
       together,  provide  features  like  dynamic  extensibility  and dynamic
       typing with automatic conversion, that make them well suited for  rapid
       application development.

       The  basic  object  system  of  XOTcl  is adopted from OTcl. The object
       system enables us to define objects, classes, and meta-classes. Classes
       are  special  objects  with  the  purpose  of  managing  other objects.
       ``Managing'' means that a class controls the creation  and  destruction
       of  its  instances  and  that  it  contains  a  repository  of  methods
       accessible for the instances. Every object may be enhanced with object-
       specific  methods.  XOTcl supports single and multiple inheritance. All
       relationships in XOTcl, including class and  superclass  relationships,
       are completely dynamic and can be introspected. Through method chaining
       without explicit naming of the intended  method,  ambiguities  in  name
       resolution  of  methods  are avoided. This way a shadowed method can be
       ``mixed into'' the execution of the current method.

       XOTcl combines the ideas of scripting and object-orientation in  a  way
       that  preserves  the  benefits  of  both  of  them. It is equipped with
       several new language functionalities that help  building  and  managing
       complex systems. We added the following support:

       Dynamic  Object  Aggregations,  to provide dynamic aggregations through
       nested namespaces (objects).

       Nested Classes, to reduce the interference of  independently  developed
       program structures.

       Assertions, to reduce the interface and the reliability problems caused
       by dynamic typing and, therefore,  to  ease  the  combination  of  many
       components.

       Meta-data, to enhance self-documentation of objects and classes.

       Per-object  mixins,  as a means to improve flexibility of mixin methods
       by giving an object access to several different  supplemental  classes,
       which may be changed dynamically.

       Per-class mixins, as a means to improve flexibility of mixin methods to
       a class, all instances of the class have access to the mixed in methods
       like  for  multiple  inheritance,  but without the need of intersection
       classes.

       Filters as a means of abstractions over method invocations to implement
       large program structures, like design patterns.

       Dynamic Component Loading XOTcl integrates the Tcl package loading with
       architectrual support for integration with object-oriented  constructs.
       Moreover, it provides tracking/tracing of component loading.

KEYWORDS

       argument, interpreter, prompt, script file, shell



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