merging two xml files into single xml file

i hav to merge 2 xml files in to single xml file

my xml files are

input1.xml

-

<?xml version="1.0"?>

<PreVCD>

<component name="stack">

<subpath path="stack_environment">

<variable var="ins" symbol="!" wireonbus="1"/>

</subpath>

</component>

<dump>

<time t="0">

<data>

<symbol sign="!" value="0"/>

</data>

</time>

<time t="10">

<data>

<symbol sign="!" value="1"/>

</data>

</time>

<time t="25">

<data>

<symbol sign="!" value="0"/>

</data>

</time>

</dump>

</PreVCD>

input2.xml

--

<?xml version="1.0"?>

<PreVCD>

<component name="stack">

<subpath path="stack_behavior">

<variable var="i" symbol="@" bussize="1"/>

</subpath>

</component>

<dump>

<time t="0">

<data>

<symbol sign="@" value="0"/>

</data>

</time>

<time t="5">

<data>

<symbol sign="@" value="1"/>

</data>

</time>

<time t="10">

<data>

<symbol sign="@" value="0"/>

</data>

</time>

<time t="20">

<data>

<symbol sign="@" value="1"/>

</data>

</time>

</dump>

</PreVCD>

The ouput should look like:

<PreVCD>

<component name="stack">

<subpath path="stack_behavior">

<variable var="i" symbol="@" bussize="1"/>

</subpath>

<subpath path="stack_environment">

<variable var="ins" symbol="!" wireonbus="1"/>

</subpath>

</component>

<dump>

<time t="0">

<data>

<symbol sign="@" value="0"/>

<symbol sign="!" value="0"/>

</data>

</time>

<time t="5">

<data>

<symbol sign="@" value="1"/>

</data>

</time>

<time t="10">

<data>

<symbol sign="@" value="0"/>

<symbol sign="!" value="1"/>

</data>

</time>

<time t="20">

<data>

<symbol sign="@" value="1"/>

</data>

</time>

<time t="25">

<data>

<symbol sign="!" value="0"/>

</data>

</time>

</dump>

</PreVCD>

thanks for any advice

[2782 byte] By [xslta] at [2007-10-3 6:45:15]