```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>Spanish-Differe@14:09:40</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>3</hlevel>
            <item_name>Spanish</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Language\Spanish\</item_key>
            <item_icon>MA</item_icon>
            <tooltip>Demographic \ Language \ Spanish</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
    <panel>
        <panel_number>2</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>4</hlevel>
            <item_name>Differential Request (Group:DIFFR)</item_name>
            <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB53) Hematology\(LLB55) Blood Differential %\DIFFR\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Labtests \ Hematology \ Blood Differential% \ Differential Request (Group:DIFFR)</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 patients who have a demographic attribute indicating they speak Spanish and have had a differential request (DIFFR) blood test performed at any time.