getting tag names

[Ervin Loh]

i have the following xml documents:
<Control>
<Item>
<EP>
<EPName>epname1</EPName>
<TASK>
<TASKKey>taskname1</TASKKey>
<ACTION>
<ACTIONName> TESTing </ACTIONName>
</ACTION>
</TASK>
<TASK>
<TASKKey>taskname2</TASKKey>
<ACTION>
<ACTIONName> TESTing2 </ACTIONName>
</ACTION>
<ACTION>
<ACTIONName> TESTing3 </ACTIONName>
</ACTION>
</TASK>
</EP>
<PO>
<POKEYS> sss </POKEYS>
<ORDERITEM>
<ITEMName> GOOD To Eat </ITEMName>
</ORDERITEM>
<ORDERITEM>
<ITEMName> GOOD To Eat </ITEMName>
</ORDERITEM>
</PO>
</Item>
<Item>
<EP>
<EPName>epname2</EPName>
<TASK>
<TASKKey>taskname1</TASKKey>
<ACTION>
<ACTIONName> TESTing11 </ACTIONName>
</ACTION>
<ACTION>
<ACTIONName> TESTing22 </ACTIONName>
</ACTION>
</TASK>
<TASK>
<TASKKey>taskname2</TASKKey>
<ACTION>
<ACTIONName> TESTing33 </ACTIONName>
</ACTION>
</TASK>
</EP>
<PO>
<POKEYS> sss </POKEYS>
<ORDERITEM>
<ITEMName> GOOD To Eat </ITEMName>
</ORDERITEM>
<ORDERITEM>
<ITEMName> GOOD To Eat </ITEMName>
</ORDERITEM>
</PO>
</Item>
</Control>
Is there a way to get the Tag name at a certain level without knowing its
name? Like the third level tag is 'EP' and we want to get the string 'EP'.
Or can we get a vector of tag names at the Third level.
Or can we get a vector of elements at the third level and then get the tag
names from the elements?
Also can we get an Element from another Element.
will appreciate if someone can show me some working codes.