Description:
------------
When a schema includes another schema that doesn't declare a namespace (i.e. no xmlns), the included schema does not adopt the targetNamespace of the includer.

Short script linked below outputs EXPECTED and ACTUAL result. Although both results are returned by a SOAP client, the EXPECTED output is from an XSD altered with the namespace of the includer (which provides the desired effect, yet defeats the purpose).

This impacts the process of marshaling the return value of __soapCall() as content for included types will be missing (as shown in the test script).

Tested on Windows (PHP7.3.7) and Linux (PHP7.3.7 and PHP7.2.19)


Test script:
---------------
https://gist.github.com/webgraphe/d0a665aaad3c827b041eabb9128b62f7

Expected result:
----------------
Running the script from the command line, the output should be:

ACTUAL
TYPES: struct User {
 int Amount;
 string CurrencyCode;
}
RESPONSE: {
    "Amount": 123,
    "CurrencyCode": "USD"
}

EXPECTED
TYPES: struct User {
 int Amount;
 string CurrencyCode;
}
RESPONSE: {
    "Amount": 123,
    "CurrencyCode": "USD"
}


Actual result:
--------------
Running the script from the command line, the output actually is:

ACTUAL
TYPES: struct User {
}
RESPONSE: {}

EXPECTED
TYPES: struct User {
 int Amount;
 string CurrencyCode;
}
RESPONSE: {
    "Amount": 123,
    "CurrencyCode": "USD"
}