writeWIxml {widgetInvoke}R Documentation

Functions to read and write widgetInvoke XML files


These functions are used to serialize object of class wFun to and from XML files.


writeWIxml(wFun, file = paste(funName(wFun), "xml", sep = "."))


wFun An object of class wFun to serialize.
file The filename to use for reading or writing.


The class wFun is used to create the user interface in the widgetInvoke function. These wFun objects must be precreated for any given function, and then stored in XML format in the inst/wFun directory of the appropriate package, and are then read in with readWIxml when the user calls widgetInvoke for that function.

The XML format used first defines the primary tag of wFun, which indicates the start of a wFun definition. There are two main sub-fields in the wFun block: funName and funArgList. The former simply contains a string indicating the name of this function. The funArgList block itself contains a series of smaller blocks, each representing an argument to the function.

Within the funArgList are a series of funArg blocks. Within each funArg are six tags. The first is argName, detailing the argument's name. The second is argDefault, which if not empty is the default value of the argument. Next is argType, which describes the type of the argument (e.g. character, numeric, logical, or ANY for an untyped argument). The argLocation field specifies which tab this argument appears on in the widgetInvoke notebook, and argWidgetType describes the type of widget to use in displaying this argument. Finally, the argRequired field is a logical value specifying if this argument is required to be filled in by the user (or a default) before evaluation of the function.

As an example, the following is an example for the function apropos:

    <?xml version="1.0"?>
    <wFun xmlns:bt="http://www.bioconductor.org/WINVOKE">


The readWIxml will return an object of class wFun representing the data stored in the specified XML file.
The writeWIxml function has no return value.


Jeff Gentry

See Also

createWF, widgetInvoke


   z <- readWIxml(system.file("wFun-example", "apropos.xml",
   writeWIxml(z, file=tempfile())

[Package widgetInvoke version 0.0.9 Index]