Not a question so much as an fyi for other beginners like me.
I have found that when creating a record by using *JSON content*, things 
have to be specified carefully when inserting a NULL.

You cannot do any of the following:
CREATE VERTEX test CONTENT {mydate : null, mystring : null, myembedded : 
null}
CREATE VERTEX test CONTENT {mydate : NULL, mystring : NULL, myembedded : 
NULL}

You have to do the following:
create vertex test content {mydate : [], str : '', myembedded : { "@type" : 
"d" }}

However, when creating without JSON, null is ok to use:
CREATE VERTEX test SET mydate = NULL, str = NULL , myembedded = NULL

If you're using Oriento/Node.js, nothing seems to work
db.vertex.create({ '@class': 'User', mydate: ???, ...


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