```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns4:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/">
    <query_name>ATYPICAL LYMPHS@16:39:48</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <panel>
        <panel_number>1</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>5</hlevel>
            <item_name>ATYPICAL LYMPHS (LOINC:15192-8)</item_name>
            <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB53) Hematology\(LLB55) Blood Differential %\ATYPS\LOINC:15192-8\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Labtests \ Hematology \ Blood Differential% \ Atypical Lymphs (Group:ATYPS) \ Atypical Lymphs (LOINC:15192-8)</tooltip>
            <class>ENC</class>
            <constrain_by_value>
                <value_operator>IN</value_operator>
                <value_constraint>('&lt; 5% BANDS SEEN ON SMEAR')</value_constraint>
                <value_type>TEXT</value_type>
            </constrain_by_value>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>5</hlevel>
            <item_name>ATYPICAL LYMPHS (LOINC:15192-8)</item_name>
            <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB53) Hematology\(LLB55) Blood Differential %\ATYPS\LOINC:15192-8\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Labtests \ Hematology \ Blood Differential% \ Atypical Lymphs (Group:ATYPS) \ Atypical Lymphs (LOINC:15192-8)</tooltip>
            <class>ENC</class>
            <constrain_by_value>
                <value_operator>IN</value_operator>
                <value_constraint>('++')</value_constraint>
                <value_type>TEXT</value_type>
            </constrain_by_value>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find all instances where the test for Atypical Lymphs (LOINC:15192-8) is performed in the Blood Differential section of the Hematology lab tests, with the result being either "&lt; 5% BANDS SEEN ON SMEAR" or "++". This query will search for these specific results within the i2b2 Labtests database using the provided xml structure.