#30 Namespace Recursion

[David Zabala]

Hi,

I'm triying to generate a class for a UBL xsd (https://docs.oasis-open.org/ubl/prd1-UBL-2.1/xsd/common/UBL-CommonBasicComponents-2.1.xsd) and I get the following error:

RuntimeError: Extension/restriction recursion detected.  Suggest you check definitions of types TextType and TextType.

The recursion is generated at this line:

<xsd:complexType name="TextType">
      <xsd:simpleContent>
         <xsd:extension base="udt:TextType"/>
      </xsd:simpleContent>
 </xsd:complexType>

The names are the same but the namespace is different.

[Dave Kuhlman]

David,

Thanks for the report and the link to the schemas.

I've looked into this a bit.
I don't think I'm going to be able to fix it.

It looks like fixes would be needed at multiple places in the code.
There are several other places in the code where similar
recursion-limit-exceeded occurs. And, I don't even know the correct
way to fix any of those places. I can patch those to skip the
recursion error, but then the module that we generate is incomplete.

If you have a suggestion or a patch, please let me know.

I'll do a little more study, but I don't have that hope.

Dave

[Ameya Vikram Singh]

I hit into this issue recently while trying to convert an xsd specification to python classes using this tool.
I am using the following repository to convert IP-XACT xsd specification:
https://github.com/olofk/ipxact_gen

I used the following command to generate a single file output:

PYTHONPATH=. generateDS -f -o pyout/ipx.py --user-methods=gends_user_methods.py 2014/index.xsd

Which results in successful conversion with some warnings:

*** warning.  Removing child with duplicate name: "activeInterface"
*** warning.  Removing child with duplicate name: "hierInterface"
*** warning.  Removing child with duplicate name: "range"
*** warning.  Removing child with duplicate name: "driveConstraint"
*** warning.  Removing child with duplicate name: "loadConstraint"
*** warning.  Removing child with duplicate name: "loadConstraint"
*** warning.  child loadConstraint already removed
*** warning.  Removing child with duplicate name: "externalPortReference"
*** warning.  Removing child with duplicate name: "linkerCommandFile"

But when trying to enable the --one-file-per-xsd option to have a bunch of python modules to be used to support reading IP-XACT xml files.

PYTHONPATH=. generateDS -f --one-file-per-xsd --output-directory pyout --module-suffix="ipxact" -o ipx --user-methods=gends_user_methods.py 2014/index.xsd

It fails with the error message mentioned below:

*** warning.  Removing child with duplicate name: "range"
*** warning.  Removing child with duplicate name: "externalPortReference"
*** warning.  Removing child with duplicate name: "activeInterface"
*** warning.  Removing child with duplicate name: "hierInterface"
*** warning.  Removing child with duplicate name: "driveConstraint"
*** warning.  Removing child with duplicate name: "loadConstraint"
*** warning.  Removing child with duplicate name: "loadConstraint"
*** warning.  child loadConstraint already removed
*** warning.  Removing child with duplicate name: "linkerCommandFile"
Traceback (most recent call last):
  File "/home/ameya/venv/bin/generateDS", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/ameya/venv/bin/generateDS.py", line 9939, in main
    parseAndGenerate(
  File "/home/ameya/venv/bin/generateDS.py", line 9385, in parseAndGenerate
    root.annotate()
  File "/home/ameya/venv/bin/generateDS.py", line 1071, in annotate
    self.fix_dup_names(already_seen)
  File "/home/ameya/venv/bin/generateDS.py", line 1496, in fix_dup_names
    child.fix_dup_names(already_seen)
  File "/home/ameya/venv/bin/generateDS.py", line 1496, in fix_dup_names
    child.fix_dup_names(already_seen)
  File "/home/ameya/venv/bin/generateDS.py", line 1464, in fix_dup_names
    self.collectElementNames(elementNames, 0)
  File "/home/ameya/venv/bin/generateDS.py", line 1511, in collectElementNames
    parent.collectElementNames(elementNames, count)
  File "/home/ameya/venv/bin/generateDS.py", line 1511, in collectElementNames
    parent.collectElementNames(elementNames, count)
  File "/home/ameya/venv/bin/generateDS.py", line 1511, in collectElementNames
    parent.collectElementNames(elementNames, count)
  [Previous line repeated 97 more times]
  File "/home/ameya/venv/bin/generateDS.py", line 1510, in collectElementNames
    raise RuntimeError(msg)
RuntimeError: Extension/restriction recursion detected.  Suggest you check definitions of types apiType and apiType.

Seems like it falls over while trying to split into multiple files, but single file generation works without any issues.

Let me know in case you need more inputs.

Ameya