[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?