Stack Overflow when parsing recursive types about go-xml HOT 6 OPEN

Sorry thought I was on the wrong github repo. I still have this issue.

from go-xml.

Thanks for the report.

It's possible that a loop was created in the tree during parsing by one of the passes in the xsd package.

If you are able to share the xsd file I can take a look. If you're not, you could start by running the xsdparse utility against the document. xsdparse will just parse the file and apply some normalization steps. That will rule out any transformations that the xsdgen package performs.

from go-xml.

I get the same problem with xsdparse.

Here is the file in question. I added some logging in question and I think its to do with the global attributes file. It is pretty big.

Attachment removed

Let me know when you have the file and I will remove the link.

from go-xml.

Thanks, I have it and reproduced your issue.

I am still in the process of debugging. The problem appears to be in the xsd.flattenRef transformation. It is creating a loop in the document tree. This appears to be a recently introduced bug, since I was able to parse the documents with an older version of xsdparse

from go-xml.

I think I see the issue. There is an element in mod_base.xsd refers to itself:

<xs:element name="sup">
  <xs:complexType mixed="true">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
      ...
      <xs:element ref="sup"/>

XML schema does allow recursive types[1], I've just never accounted for them. For xsdgen, we could use pointers to model a recursive type:

type Sup struct {
    ...
    Sup *Sup
    ...
}

from go-xml.

That sounds like a great idea. Thank you for the prompt investigation

from go-xml.