step2: start the server:
java -cp server.zip minixyleme.server.Run
-base:file:./samples/bib-base.xml
The following messages are displayed, indicating that the server has
been successfully started:
Database set to file:./samples/bib-base.xml
Reading file:./samples/bib-base.xml
Parsing file:./samples/bib-base.xml
Creating biblio forest.
biblio.xml added to biblio
Server successfully started on port 4444
The bib-base.xml file contains the description of the "database" we
are working on. It has the following structure:
<?xml version="1.0" ?>
<mxbase>
<forest name="biblio">
<file href="biblio.xml"/>
</forest>
</mxbase>
meaning that this base is composed of a forest (e.g. a named
collection of XML documents) called biblio, containing the document
biblio.xml.
We will see in the next example that a base can contain several forests,
each of them containing several documents.
The biblio.xml file is as follows:
<?xml version="1.0"?>
<bib>
<book>
<title>Harold
and the Purple Crayon</title>
<author>
<last>Johnson</last>
<first>Crockett</first>
</author>
<pubinfo>
<publisher>Harper
and Row</publisher>
<price>4.76</price>
<year>1955</year>
</pubinfo>
</book>
<book>
<title>Harold's
Fairy Tale</title>
<author>
<last>Johnson</last>
<first>Crockett</first>
</author>
<pubinfo>
<publisher>Harper
and Row</publisher>
<price>4.76</price>
<year>1956</year>
</pubinfo>
</book>
<book>
<title>Rise Up
Singing</title>
<author>
<last>Blood</last>
<first>Peter</first>
</author>
<author>
<last>Patterson</last>
<first>Annie</first>
</author>
<pubinfo>
<publisher>Sing
Out Corporation</publisher>
<price>15.45</price>
<year>1988</year>
</pubinfo>
</book>
</bib>
We are now going to see how to query this base.
step 3: start the client
Start a new shell and then go to the minixyleme directory.
Start the client:
java -cp client.zip minixyleme.client.Run
-host:hostname
where hostname is the name of the machine where the
server is running. In this example, it is the name of the machine you are
working on. If everything went ok, you should see the following messages:
Starting MiniXyleme Client
Type "help" for help.
->
meaning that the client is waiting for a command. Type
help
and return to see a short description of available commands.
->help
MiniXyleme Client commands summary
info: displays infos on connection and output
file name.
query: switch to query mode.
?> indicates
that you are in query mode.
You
can type in a multiline query.
End
it with ; to send it to the server
or with
;; to abort.
output: ask for the file where to write result.
exit: same as quit.
quit: quit this program.
help: displays this help.
q: a shortcut for query.
->
-> indicates that the client is in command mode. In
order to enter the query mode, just type q and then
return.
The command line prompt becomes ?>, indicating that the current
mode is set to query.
You can now type in any valid X-OQL query, for instance:
?> biblio;
The result is:
<?xml version="1.0"?>
<result>
<bib>
<book>
<title>Harold
and the Purple Crayon</title>
<author>
<last>Johnson</last>
<first>Crockett</first>
</author>
<pubinfo>
<publisher>Harper and Row</publisher>
<price>4.76</price>
<year>1955</year>
</pubinfo>
</book>
<book>
<title>Harold's
Fairy Tale</title>
<author>
<last>Johnson</last>
<first>Crockett</first>
</author>
<pubinfo>
<publisher>Harper and Row</publisher>
<price>4.76</price>
<year>1956</year>
</pubinfo>
</book>
<book>
<title>Rise
Up Singing</title>
<author>
<last>Blood</last>
<first>Peter</first>
</author>
<author>
<last>Patterson</last>
<first>Annie</first>
</author>
<pubinfo>
<publisher>Sing Out Corporation</publisher>
<price>15.45</price>
<year>1988</year>
</pubinfo>
</book>
</bib>
</result>
Note that in order to produce a valid XML document, the result of a
query is embedded into a result element.
Some example queries
?> select b
?> from b in biblio/bib/book, a in b/author
?> where a/first = "Crockett" and a/last="Johnson";
<?xml version="1.0"?>
<result>
<book>
<title>
Harold and
the Purple Crayon
</title>
<author>
<last>
Johnson </last>
<first>
Crockett </first>
</author>
<pubinfo>
...
</pubinfo>
</book>
<book>
<title>
Harold's Fairy
Tale
</title>
<author>
<last>
Johnson </last>
<first>
Crockett </first>
</author>
<pubinfo>
...
</pubinfo>
</book>
</result>
?> select b/title
?> from b in biblio//book,
?> where b//price>10;
<result>
<title> Rise Up Singing </title>
</result>
?> select <titre> text(b/title) </>
?> from b in biblio//book;
<result>
<titre> Harold and the Purple Crayon
</titre>
<titre> Harold's Fairy Tale </titre>
<titre> Rise Up Singing </titre>
</result>
step 4: quit the client
-> exit
step 5: quit the server
Go back to the shell where the server was started
and type <CTRL+C>
where pariscopeletterA..Z.xml are XML files containing informations about films and cinemas in Paris area. Their structure is given by the following DTD:
<!ELEMENT FILMS (DATE, FILM*)>
<!ATTLIST FILMS LETTER (A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z)
#REQUIRED>
<!ELEMENT FILM (A, RESUME+, SALLE+)>
<!ELEMENT TITLE (#PCDATA)>
<!ELEMENT RESUME (#PCDATA)>
<!ELEMENT SALLE (NAME, ADDRESS,
TIME?)>
<!ELEMENT NAME (#PCDATA)>
<!ELEMENT ADDRESS (#PCDATA)>
<!ELEMENT TIME (#PCDATA)>
<!ELEMENT DATE (#PCDATA)>
<!ATTLIST DATE VALUE CDATA #IMPLIED>
<!ELEMENT A (TITLE)>
<!ATTLIST A type (SIMPLE |EXTENDED)
#FIXED "SIMPLE"
href CDATA #REQUIRED
show (NEW | EMBED |REPLACE) #FIXED "REPLACE">
step 1: start the server
java -cp ./classes/server minixyleme.server.Run
-base:file:./samples/pariscope.xml
step 2: start the client
In a new shell
java -cp client.zip minixyleme.client.Run
-host:hostname
Is the film "The Million Dollar Hotel" in pariscope?
?>select
?> t
?>from
?> f in pariscope//FILM,
?> t in f//TITLE
?>where
?> t matches '[Mm]illion [Dd]ollar';
Construct a "film" element, containing a subelement
"titre" and the cinema in which it is performed, for each film in pariscope
such that the title of this film contains the string "Million"
and the cinema is located in the 1st arrondissment ?
?>select
?> <film>
?> <titre> text(t) </>,
?> s
?> </>
?>from
?> f in pariscope/FILMS/FILM,
?> t in f//TITLE,
?> s in f/SALLE
?>where
?> t matches 'Million'
?> and
?> s/ADDRESS matches '1er
arr';
Retrieve the document referenced by any film in
pariscope such that the text of this film contains the string "Million"
?>select
?> document(f/A@HREF)
?>from
?> f in pariscope/FILMS/FILM
?>where
?> f matches 'Million';
ANTLR 1989-2000 Developed by jGuru.com (MageLang
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and reuse of software generally.
NO WARRANTY
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE
IS NO
WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE
LAW.
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
OF THE
LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE,
YOU ASSUME
THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED
TO IN
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO
YOU
FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
THE
LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES
OR A
FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN
IF
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY
OF SUCH
DAMAGES.
END OF TERMS AND CONDITIONS
Appendix: How to Apply These Terms to Your New Libraries
If you develop a new library, and you want it to be of the
greatest
possible use to the public, we recommend making it free software
that
everyone can redistribute and change. You can do so by permitting
redistribution under these terms (or, alternatively, under the
terms of the
ordinary General Public License).
To apply these terms, attach the following notices to the
library. It is
safest to attach them to the start of each source file to most
effectively
convey the exclusion of warranty; and each file should have at
least the
"copyright" line and a pointer to where the full notice is found.
<one line to give the library's name and a
brief idea of what it does.>
Copyright (C) <year> <name of author>
This library is free software; you can redistribute
it and/or
modify it under the terms of the GNU Library
General Public
License as published by the Free Software Foundation;
either
version 2 of the License, or (at your option)
any later version.
This library is distributed in the hope that
it will be useful,
but WITHOUT ANY WARRANTY; without even the implied
warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library
General Public
License along with this library; if not, write
to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge,
MA 02139, USA.
Also add information on how to contact you by electronic and paper mail.
You should also get your employer (if you work as a programmer)
or your
school, if any, to sign a "copyright disclaimer" for the library,
if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in
the
library `Frob' (a library for tweaking knobs) written by
James Random Hacker.
<signature of Ty Coon>, 1 April 1990
Ty Coon, President of Vice
That's all there is to it!