Change set usage

Hi Team,

How many change set can we use in single XML file. what is the Limit

Like below: here i have used 2 change set.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<databaseChangeLog
    xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ext="http://www.liquibase.org/xml/ns/dbchangelog-ext"
    xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-2.0.xsd
    http://www.liquibase.org/xml/ns/dbchangelog-ext http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-ext.xsd">
    <property name="changeSetType" value="DML"/>
    <changeSet author="Saravanan1" id="2013" failOnError="true" runOnChange="true">
        <comment>First table</comment>
        <sql splitStatements="true">
            update query;
        </sql>
        <rollback>
            rollback query for update query
        </rollback>
    </changeSet>
    <changeSet author="Saravanan2" id="2013" failOnError="true" runOnChange="true">
        <comment>second table</comment>
        <sql splitStatements="true">
            update query;
        </sql>
        <rollback>
            rollback query for update query
        </rollback>   
    </changeSet>





</databaseChangeLog>