Ambition

• content cache query
• lucene query
• simple, yet flexible syntax

Current state

Can currently do this:

news

translates to

contentCache.GetContentByXPath("//news")

and

latest news

translates to

contentCache
    .GetContentByXPath("//news")
    .OrderByDescending(c => c.CreateDate)

and

latest 5 news

translates to

contentCache
    .GetContentByXPath("//news")
    .OrderByDescending(c => c.CreateDate)
    .Take(5)

Current BNF

<query>             ::= [<order>] [<limit>] <contentSelector>
<contentSelector>   ::= <documentType>
<order>             ::= "latest"
<limit>             ::= <number>

Target BNF

<query> ::=             ["I want"]
                        [["the"] <order>]
                        [<limit>]
                        <contentSelector> 
                        ["from" <route>]
                        ["where" <member> <op> <expression>]

<order> ::=             "latest" | "earliest" | "first" | "last" | "...?"

<limit> ::=             <number>

<contentSelector> ::=   <documentType> | <hierarchySelector> |
                        <hierarchySelector> <documentType>

<hierarchySelector> ::= "everything" | "children" | "descendants" | "ancestors"

<route> ::=             <contentCacheRoute>

<member> ::=            <propertyValue> | <builtinPropertyValue>
<op> ::=                # the useful ones
<expression> ::=        # to be evolved