[bdbxml] problem with dbxml distinct-values

I am not able to make this code crop work, mistakes are not but the result 
is not the wished one

Example block xml:

<block>
<id_block>2147483641</id _block>
<name_block>2147483641</name_block>
<size>2147483641</size>
<last_offset>2147483641</last_offset>
<last_byte_write>2147483641</last_byte_write>
<delete>
<offset_init>2147483641</offset_init>
<offset_fin>2147483641</offset_fin>
</delete>
<delete>
<offset_init>2147483655</offset_init>
<offset_fin>2147483667</offset_fin>
</delete>
</block>

code which is not working:

resultsBlock contains the 10 blocks and he is a XMLRESULT
...
XmlValue valueBlock = resultsBlock.next();

while (valueBlock != null) {

String nameQ = "distinct-values(/storage/block/id_block)";
long name = 0;

String sizeQ = "distinct-values(/storage/block/size)";
long size = 0;

String lastOffsetQ = "distinct-values(/storage/block/last_offset)";
long lastOffset = 0;

String nameBlockFileQ = "distinct-values(/storage/block/name_block)";
String nameBlockFile = "";

String lastByteWriteQ = "distinct-values(/storage/block/last_byte_write)";
long lastByteWrite = 0;

String deleteQ = "distinct-values(/storage/block/delete)";

XmlQueryContext documentContext = mgr.createQueryContext();
documentContext.setReturnType(XmlQueryContext.DeadValues);

ArrayList listDelete = new ArrayList();
Block block;

XmlQueryExpression nameExpr = mgr.prepare(nameQ, documentContext);
XmlResults nameResults = nameExpr.execute(valueBlock, documentContext);
name = Long.parseLong(nameResults.next().asString());

XmlQueryExpression sizeExpr = mgr.prepare(sizeQ, documentContext);
XmlResults sizeResults = sizeExpr.execute(valueBlock, documentContext);
size = Long.parseLong(sizeResults.next().asString());

XmlQueryExpression lastOffsetExpr = mgr.prepare(lastOffsetQ, 
documentContext);
XmlResults lastOffsetResults = lastOffsetExpr.execute(valueBlock, 
documentContext);
lastOffset = Long.parseLong(lastOffsetResults.next().asString());

XmlQueryExpression nameBlockFileExpr = mgr.prepare(nameBlockFileQ, 
documentContext);
XmlResults nameBlockFileResults = nameBlockFileExpr.execute(valueBlock, 
documentContext);
nameBlockFile = nameBlockFileResults.next().asString();

XmlQueryExpression lastByteWriteExpr = mgr.prepare(lastByteWriteQ, 
documentContext);
XmlResults lastByteWriteResults = lastByteWriteExpr.execute(valueBlock, 
documentContext);
lastByteWrite = Long.parseLong(lastByteWriteResults.next().asString());

XmlQueryExpression deleteExpr = mgr.prepare(deleteQ, documentContext);
XmlResults deleteResults = deleteExpr.execute(valueBlock, documentContext);

block = new Block(lastByteWrite, lastOffset, listDelete, name, 
nameBlockFile, size);
listaBlocchi.add(block);

// Ricavo il singolo blocco
valueBlock = resultsBlock.next();

}


wished result: an ArrayList containing the ten blocks

obtained result: an ArrayList containing 10 blocks with the values of the 
first block

could you show me where I make a mistake?