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+====== < param > ======
+===== Description =====
+The <param> element specifies values that are passed into the <object> or in <subdialog>. When <param> is contained in a <subdialog> element, the values specified are used to initialize <var> declarations in the subdialog that is invoked.  The initialization takes precedence over the expr attribute in <var>.
+===== Syntax =====
+<code>
+<param
+name="String"
+value="String"
+expr="ECMAScript_Expression"
+valuetype="data" | "ref"
+type="MIME_type"/>
+</code>
+===== Attributes =====
+|name|The name attribute is the name associated with the parameter. This attribute is required.|
+|value|The value attribute is the string value of the parameter. This attribute is required and either value or expr is required.|
+|expr|The expr attribute is an expression that yields the parameter value.  This attribute is required and either value or expr is required.|
+|valuetype|The valuetype attribute indicates the reference type of the value.  This attribute is not used for <subdialog>.  This attribute is optional and defaults to data. \\ * data – the value is actual data. \\ * ref – the value referenced by a URI.|
+|type|The type attribute is the media type of the result provided by a URI if the valuetype is ref.  This is only relevant for the uses of <param> in the <object> element.  This attribute is optional.|
+===== Parents =====
+<code>
+<object>, <subdialog>
+</code>
+===== Children =====
+<code>
+None.
+</code>
+===== Extensions =====
+<code>
+None.
+</code>
+===== Limitations/Restrictions =====
+<code>
+None.
+</code>
+===== Example Code =====
+This represents a document that calls the subdialog:
+<code>
+<?xml version="1.0"?>
+<vxml version="2.0" xmlns="http://www.w3.org/2001/vxml">
+ <form>
+  <subdialog name="result" src="subdialog.vxml">
+   <param name="birthday" expr="'2000-02-10'"/>
+   <param name="age" value="100"/>
+   <filled>
+    <submit next="process.vxml"/>
+   </filled>
+  </subdialog>
+ </form>
+</vxml>
+</code>
+This represents a document containing the subdialog:
+<code>
+<?xml version="1.0"?>
+<?xml version="1.0"?>
+<vxml version="2.0" xmlns="http://www.w3.org/2001/vxml">
+ <form id="getdriverslicense">
+  <var name="birthday"/>
+  <var name="age"/>
+  <block>
+   <prompt>
+    Hello, your birthday is <value expr="birthday"/>
+    and you are <value expr="age"/> years old.
+   </prompt>
+   <return/>
+   </block>
+ </form>
+</vxml>
+</code>