---
# System prepended metadata

title: DDIA - chp 2

---

# DDIA - chp 2

Created Time: Jul 23, 2020 11:34 PM

![DDIA%20-%20chp%202%205c53dd04c0c64f329211db07c8dcc13f/Untitled.png](DDIA%20-%20chp%202%205c53dd04c0c64f329211db07c8dcc13f/Untitled.png)

# Some thing
Json![](https://i.imgur.com/p0LIuPh.png)


```json
{
"user_id": 251,
"first_name": "Bill",
"last_name": "Gates",
"summary": "Co-chair of the Bill & Melinda Gates... Active blogger.",
"region_id": "us:91",
"industry_id": 131,
"photo_url": "/p/7/000/253/05b/308dd6e.jpg",
"positions": [
{"job_title": "Co-chair", "organization": "Bill & Melinda Gates Foundation"},
{"job_title": "Co-founder, Chairman", "organization": "Microsoft"}
],
"education": [
{"school_name": "Harvard University", "start": 1973, "end": 1975},
{"school_name": "Lakeside School, Seattle", "start": null, "end": null}
],
"contact_info": {
"blog": "http://thegatesnotes.com",
"twitter": "http://twitter.com/BillGates"
}
}
```

## Simple xml document

```xml
<rdf:RDF xmlns="urn:example:"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
	<Location rdf:nodeID="idaho">
	<name>Idaho</name>
	<type>state</type>
<within>
<Location rdf:nodeID="usa">
<name>United States</name>
<type>country</type>
<within>
<Location rdf:nodeID="namerica">
<name>North America</name>
<type>continent</type>
</Location>
</within>
</Location>
</within>
</Location>
<Person rdf:nodeID="lucy">
<name>Lucy</name>
<bornIn rdf:nodeID="idaho"/>
</Person>
</rdf:RDF>
```