equal
deleted
inserted
replaced
1 |
1 |
2 |
2 |
3 Implementation |
3 Implementation |
4 -------------- |
4 -------------- |
|
5 |
5 BNF grammar |
6 BNF grammar |
6 ~~~~~~~~~~~ |
7 ~~~~~~~~~~~ |
7 |
8 |
8 The terminal elements are in capital letters, non-terminal in lowercase. |
9 The terminal elements are in capital letters, non-terminal in lowercase. |
9 The value of the terminal elements (between quotes) is a Python regular |
10 The value of the terminal elements (between quotes) is a Python regular |
124 |
125 |
125 Known limitations |
126 Known limitations |
126 ~~~~~~~~~~~~~~~~~ |
127 ~~~~~~~~~~~~~~~~~ |
127 |
128 |
128 - The current implementation does not support linking two relations of type 'is' |
129 - The current implementation does not support linking two relations of type 'is' |
129 with a OR. I do not think that the negation is supported on this type of |
130 with an OR. I do not think that the negation is supported on this type of |
130 relation (XXX FIXME to be confirmed). |
131 relation (XXX FIXME to be confirmed). |
131 |
132 |
132 - Relations defining the variables must be left to those using them. For |
133 - Relations defining the variables must be left to those using them. For |
133 example:: |
134 example:: |
134 |
135 |
138 |
139 |
139 Point P where P abs X, P value X+Y, P ord Y |
140 Point P where P abs X, P value X+Y, P ord Y |
140 |
141 |
141 is not. |
142 is not. |
142 |
143 |
143 - missing proper explicit type conversion, COALESCE and certainly other things... |
144 - missing proper explicit type conversion, COALESCE and certainly other things... |
144 |
145 |
145 - writing a rql query require knowledge of the schema used (with real relation |
146 - writing an rql query requires knowledge of the used schema (with real relation |
146 names and entities, not those viewing in the user interface). On the other |
147 names and entities, not those viewed in the user interface). On the other |
147 hand, we can not really bypass that, and it is the job of a user interface to |
148 hand, we cannot really bypass that, and it is the job of a user interface to |
148 hide the RQL. |
149 hide the RQL. |
149 |
150 |
150 |
151 |
151 Topics |
152 Topics |
152 ~~~~~~ |
153 ~~~~~~ |