```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>VITAMIN B12 UNS@16:56:31</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>VITAMIN B12 UNSAT BIND CAPA (LOINC:2171-7)</item_name>
            <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB16) Chemistry\(LLB31) Anemia Related Studies\B12USAT\LOINC:2171-7\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Labtests \ Chemistry \ Anemia Related Studies \ B12 Unsaturated Binding (Group:B12USAT) \ Vitamin b12 unsat bind capa (LOINC:2171-7)</tooltip>
            <class>ENC</class>
            <constrain_by_value>
                <value_operator>LT</value_operator>
                <value_constraint>1000</value_constraint>
                <value_unit_of_measure>ng/l</value_unit_of_measure>
                <value_type>NUMBER</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 Vitamin B12 Unsaturated Binding Capacity (LOINC:2171-7) test result is less than 1000 ng/l, with a specificity scale of 0, accuracy scale of 100, and panel timing set to "ANY". This query will display results from the "Labtests" category, specifically within the "Chemistry" subcategory, under the "Anemia Related Studies" sub-subcategory, and the "B12 Unsaturated Binding (Group:B12USAT)" sub-sub-subcategory. The query will return results with a high level of 5 and the icon "LA" will be displayed. The tooltip for this query will read "Labtests \ Chemistry \ Anemia Related Studies \ B12 Unsaturated Binding (Group:B12USAT) \ Vitamin b12 unsat bind capa (LOINC:2171-7)".