```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns3:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/">
    <query_name>Chronic obstructive asthma@14:52:31</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>1</hlevel>
            <item_name>Chronic obstructive asthma</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\(493) Asthma\(493-2) Chronic obstructive asthma\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Respiratory system \ Chronic obstructive diseases \ Asthma \ Chronic obstructive asthma</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Admit Diagnosis</modifier_name>
                <modifier_key>\\i2b2_DIAG\Admit Diagnosis\</modifier_key>
                <applied_path>\i2b2\Diagnoses\Respiratory system (460-519)\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>1</hlevel>
            <item_name>Chronic obstructive asthma</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\(493) Asthma\(493-2) Chronic obstructive asthma\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Respiratory system \ Chronic obstructive diseases \ Asthma \ Chronic obstructive asthma</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Mild</modifier_name>
                <modifier_key>\\i2b2_DIAG\Severity\Mild\</modifier_key>
                <applied_path>\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>1</hlevel>
            <item_name>Chronic obstructive asthma</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\(493) Asthma\(493-2) Chronic obstructive asthma\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Respiratory system \ Chronic obstructive diseases \ Asthma \ Chronic obstructive asthma</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Moderate</modifier_name>
                <modifier_key>\\i2b2_DIAG\Severity\Moderate\</modifier_key>
                <applied_path>\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>1</hlevel>
            <item_name>Chronic obstructive asthma</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\(493) Asthma\(493-2) Chronic obstructive asthma\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Respiratory system \ Chronic obstructive diseases \ Asthma \ Chronic obstructive asthma</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Moderate to severe</modifier_name>
                <modifier_key>\\i2b2_DIAG\Severity\Moderate To Severe\</modifier_key>
                <applied_path>\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>1</hlevel>
            <item_name>Chronic obstructive asthma</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\(493) Asthma\(493-2) Chronic obstructive asthma\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Respiratory system \ Chronic obstructive diseases \ Asthma \ Chronic obstructive asthma</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Principal Diagnosis</modifier_name>
                <modifier_key>\\i2b2_DIAG\Principal Diagnosis\</modifier_key>
                <applied_path>\i2b2\Diagnoses\Respiratory system (460-519)\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>1</hlevel>
            <item_name>Chronic obstructive asthma</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\(493) Asthma\(493-2) Chronic obstructive asthma\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Respiratory system \ Chronic obstructive diseases \ Asthma \ Chronic obstructive asthma</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Mild to moderate</modifier_name>
                <modifier_key>\\i2b2_DIAG\Severity\Mild To Mod\</modifier_key>
                <applied_path>\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>1</hlevel>
            <item_name>Chronic obstructive asthma</item_name>
            <item_key>\\i2b2_DIAG\i2b2\Diagnoses\Respiratory system (460-519)\Chronic obstructive diseases (490-496)\(493) Asthma\(493-2) Chronic obstructive asthma\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Respiratory system \ Chronic obstructive diseases \ Asthma \ Chronic obstructive asthma</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Secondary Diagnosis</modifier_name>
                <modifier_key>\\i2b2_DIAG\Secondary Diagnosis\</modifier_key>
                <applied_path>\i2b2\Diagnoses\Respiratory system (460-519)\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns3:query_definition>

```

I want to find chronic obstructive asthma diagnoses in the Respiratory system (460-519) category under Chronic obstructive diseases (490-496) subcategory with varying severity levels, including mild, moderate, moderate to severe, and principal and secondary diagnoses.