As we discussed before, DocumentDB is a schema-free database containing JSON documents. By default, DocumentDB applies indexing to all document properties. This means you can specifically query for all the properties inside a document.
Internally, DocumentDB represents all documents as trees. A dummy root node is created to make every document accessible via this root node. Every property of a document is a node in the tree representation.
The following code illustrates how one of our PersonInformation class's document is represented as a tree in JSON:
{
"LastName": "Doe",
"FirstName": "John",
"DateOfBirth": {
"Date": "1971-01-01T00:00:00",
"Epoch": 31536000
},
"NumberOfHomeAutomationDevices": 1,
"HomeAutomationDevices": [
{
"Manufacturer": "Contoso Inc.",
"Type": "Heater",
"Location": "Attic",
"Price": 50
}
],
"Roles": [
{
"RoleName": "User"
}
]
}