poi/src/records/definitions/linked_data_record.xml

<?xml version="1.0"?>
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<record id="0x1051" name="LinkedData" excel-record-id="AI" package="org.apache.poi.hssf.record">
    <suffix>Record</suffix>
    <extends>Record</extends>
    <description>Describes a linked data record.  This record refers to the series data or text.</description>
    <author>Glen Stampoultzis (glens at apache.org)</author>
    <fields>
        <field type="int" size="1" name="link type" description="What type of link is this?">
            <const name="title or text" value="0" description="links a series title or text"/>
            <const name="values" value="1" description="links to series values"/>
            <const name="categories" value="2" description="links to categories"/>
        </field>
        <field type="int" size="1" name="reference type">
            <const name="default categories" value="0" description="use default categories"/>
            <const name="direct" value="1" description="reference to some text or a value entered directly into the formula bar"/>
            <const name="worksheet" value="2" description="reference links to worksheet"/>
            <const name="not used" value="3" description="??"/>
            <const name="error reported" value="4" description="error reported"/>
        </field>
        <field type="bits" size="2" name="options">
            <bit number="0" name="custom number format" description="true if this object has a custom number format"/>
        </field>
        <field type="int" size="2" name="index number fmt record"/>
        <field type="custom:org.apache.poi.hssf.record.LinkedDataFormulaField"
            size="var" name="formula of link" description="formula"/>
    </fields>
</record>