Attach (recommended) or Link to PDF file here:
[Form_MGT-7.pdf](https://github.com/mozilla/pdf.js/files/6768253/Form_MGT-7.pdf)

When we try to open the above pdf, we get in the console:
```
Warning: XFA - an error occured during parsing and binding: TypeError: x.include is not a function
```
which is caused by a typo:
https://github.com/mozilla/pdf.js/blob/b9e84ba70ec5a4a30333b9092f316c9ec7b7f079/src/core/xfa/config.js#L174
 
So fixing the typo allows to open the pdf but there is only 1 page when we have 9 in using masterpdfeditor.
return this.contentType === "text/html";
  }
  [$onChild](child) {
    if (
      this.contentType === "text/html" &&
      child[$namespaceId] === NamespaceIds.xhtml.id
    ) {
      this[$content] = child;
      return true;
    }
    if (this.contentType === "text/xml") {
      this[$content] = child;
      return true;
    }
    return false;
  }
  [$toHTML](availableSpace) {
    if (this.contentType !== "text/html" || !this[$content]) {
      
      return HTMLResult.EMPTY;
    }
    return this[$content][$toHTML](availableSpace);
  }
}
class ExObject extends XFAObject {