How many layers can xml be divided into? Are there any restrictions? Or industry standard

the problem of xml layering, I don"t know how many layers xml can divide

Xml
Jul.06,2022

for example, arrays in php can have 1-dimensional arrays, 2-dimensional n-dimensional arrays, but general business will not exceed many, unless it is the structure of infinite pole classification


as long as the hierarchy is clear, there is no limit in theory

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b375f5-2b806.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b375f5-2b806.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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