```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>Esophageal refl@14:54:45</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>Esophageal reflux</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Digestive system (520-579)\(530) Diseases of esophagus\(530-8) Other specified disorders~\(530-81) Esophageal reflux\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Diagnoses \ Digestive system \ Diseases of esophagus \ Other specified disorders of esophagus \ Esophageal reflux</tooltip>
            <class>ENC</class>
            <item_is_synonym>true</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find patients with a diagnosis of esophageal reflux within the Digestive System category, under the Diseases of Esophagus subcategory, specifically in the Other Specified Disorders of Esophagus section, with a high level of specificity and any timing. The query will have a total of one item occurrence and the specificity scale is set to 0, indicating that the query will search for exact matches. The panel number is set to 1, and the accuracy scale is set to 100, meaning that the query will have a high level of accuracy. The panel timing is set to ANY, indicating that the query will search for any time frame. The invert flag is set to 0, indicating that the query will return positive results only.