The custom metadata XML checking policy determines whether HCP allows custom metadata to be added to a namespace if it is not well-formed XML. This policy is set at the namespace level.
The XML checking policy can have a setting of enabled or disabled:
When custom metadata is added to or replaced in a namespace, HCP checks whether it’s well-formed XML. If the XML is not well-formed, HCP rejects it.
HCP accepts any data submitted as custom metadata.
XML checking applies only when custom metadata is added to or replaced in a namespace. It does not apply to custom metadata already in the namespace.