Badgerfish

BadgerFish is a convention for translating an XML document into a JSON object. Once you've got your XML document represented as a JSON object, it's easy to manipulate from within Javascript. If you're familiar with PHP's SimpleXML extension, think of BadgerFish as aiming for a similar goal: making it simpler to do common manipulations of XML documents with a predictable structure.

How does it work?

Here are the rules:

1. Element names become object properties

2. Text content of elements goes in the $ property of an object.

   <alice>bob</alice>

   becomes

   { "alice": { "$" : "bob" } }

3. Nested elements become nested properties

   <alice><bob>charlie</bob><david>edgar</david></alice>

   becomes

   { "alice": { "bob" : { "$": "charlie" }, "david": { "$": "edgar"} } }

4. Multiple elements at the same level become array elements.

   <alice><bob>charlie</bob><bob>david</bob></alice>

   becomes

   { "alice": { "bob" : [{"$": charlie" }, {"$": "david" }] } }

5. Attributes go in properties whose names begin with @.

   <alice charlie="david">bob</alice>

   becomes

   { "alice": { "$" : "bob", "@charlie" : "david" } }

6. Active namespaces for an element go in the element's @xmlns property.

7. The default namespace URI goes in @xmlns.$.

   <alice xmlns="http://some-namespace">bob</alice>

   becomes

    

   { "alice": { "$" : "bob", "@xmlns": { "$" : "http:\/\/some-namespace"} } }

8. Other namespaces go in other properties of @xmlns.

   <alice xmlns="http:\/\/some-namespace" xmlns:charlie="http:\/\/some-other-namespace">bob</alice>

   becomes

    

   { "alice": { "$" : "bob", "@xmlns": { "$" : "http:\/\/some-namespace", "charlie" : "http:\/\/some-other-namespace" } } }

9. Elements with namespace prefixes become object properties, too.

   <alice xmlns="http://some-namespace" xmlns:charlie="http://some-other-namespace"> <bob>david</bob> <charlie:edgar>frank</charlie:edgar> </alice>

   becomes

    

   { "alice" : { "bob" : { "$" : "david" , "@xmlns" : {"charlie" : "http:\/\/some-other-namespace" , "$" : "http:\/\/some-namespace"} } ,

   "charlie:edgar" : { "$" : "frank" , "@xmlns" : {"charlie":"http:\/\/some-other-namespace", "$" : "http:\/\/some-namespace"} },

   "@xmlns" : { "charlie" : "http:\/\/some-other-namespace", "$" : "http:\/\/some-namespace"} } }

    

   What's broken and/or left to do?

   1. BadgerFish throws away the text content of elements if the text content is entirely whitespace. It also doesn't provide a way to get the different text bits in an element whose content is a mix of text and children (e.g. <p>Some text <strong>is important</strong>.</p>). Perhaps those different text bits should be made available in $1, $2, etc.
   2. BadgerFish populates @xmlns in all elements where a namespace is active, not just in the elements where the namespace is declared. This may be overkill for people who don't care that much about namespaces. Perhaps allow a format that ignores @xmlns altogether?
   3. Adaptors to create BadgerFish-formatted JSON strings in languages other than PHP.
   4. Adaptors to turn BadgerFish-formatted JSON objects back into XML-formatted strings and/or DOM objects.

You can see an example below:

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cdc.gov

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