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.
const output = [];
    for (const child of this[$getChildren]()) {
      output.push(child[$text]());
    }
    return HTMLResult.success(output);
  }
}
class Keep extends XFAObject {
  constructor(attributes) {
    super(TEMPLATE_NS_ID, "keep",  true);
    this.id = attributes.id || "";
    const options = ["none", "contentArea", "pageArea"];
    this.intact = getStringOption(attributes.intact, options);
    this.next = getStringOption(attributes.next, options);
    this.previous = getStringOption(attributes.previous, options);
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.extras = null;
  }
}
class KeyUsage extends XFAObject {