I extract one number from an XML online file with Google Spreadsheets. Sometimes the number starts with a zero but the spreadsheet removes it. I'm sure the format of the cell is 'plain text' (I press `020` and `020` appears), but after entering the formula it's like if it became 'number'.

Assuming this data XML:

```
<sudoc service="ean2ppn">
<query>
<ean>9782870098585</ean>
<result>
<ppn>080253431</ppn>
</result>
</query>
</sudoc>

```

Using a formula such as: 

```
=IMPORTXML("http://www.sudoc.fr/services/ean2ppn/9782870098585","/sudoc/query/result/ppn")  

```

will return `80253431` whereas I would like it to return `080253431`. How might I achieve this?