BaseX-Talk October 2016

basex-talk@mailman.uni-konstanz.de

21 participants
28 discussions

Make BXElem return also namespace declarations
by Erdal Karaca 09 Oct '16

09 Oct '16

Hi, I am accessing the DOM tree of the collections in the embedded mode. Now, I need to process the DOM node returned by a query. For this, Item.toJava() returns a DOM Element (for my specific case/query). When calling Element#getAttributes(), I only get "direct" attributes, i.e. no namespace declarations are included in the list of attributes. Are the namespace declarations omitted intentionally? How can I make the BXElem also report them in the resulting attributes list? Thanks.

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embedded mode thread-safe?
by Erdal Karaca 09 Oct '16

09 Oct '16

Hi all, Is the embedded mode thread-safe? I mean, once I have the Context object and opened a database, is it safe to access (read/write) it from multiple threads? Will the same transaction mechanism apply as if the server mode would be used? Thanks.

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copy attributes of one node to another
by Erdal Karaca 09 Oct '16

09 Oct '16

Hi, I am trying to copy attributes of one node to another: copy $x := <test a="b" c="d"></test>, $y := parse-xml('<o a="x" c="y"></o>') modify ( delete nodes $x/@*, insert nodes $y/@* into $x ) return $x Unfortunately, the resulting $x is an empty <test/> node. I expected it to have the attributes of the parsed node. Am I using parse-xml() properly? Thanks!

2 2

problem getting -somit-xml-declaration=no to work
by Regine I. Heberlein 07 Oct '16

07 Oct '16

Hello all, I wonder whether someone could help me with what I'm sure is just some newbie error on my part. I'm running an XQuery Update using BaseX from the command line over an XML document, and I want the XML declaration to be preserved. My input is: basex -uVwsomit-xml-declaration=no <input xQuery Update file> That looks correct to me per the documentation, but when I run it, I lose the XML declaration nevertheless. (The xQuery Update executes correctly.) I've tried the following, all to no avail: --split out the -s flag, putting it as the first and last flag, respectively --setting the value to "yes" (well, I knew that wasn't going to work, but I had to check, right?) --upper case NO (ditto...) --adding the following two lines to my xQuery file: declare namespace output = "http://www.w3.org/2010/xslt-xquery-serialization"; declare option output:omit-xml-declaration "no"; I know this question has come up before, but I couldn't find an approach that worked for me in the list archives. Obviously, at this point I'm just throwing darts at the problem. I'd be grateful for any pointers! Sincerely, Regine Heberlein Principal Cataloger and Metadata Analyst, Rare Book Collections Princeton University Library One Washington Road Princeton, NJ 08540 609-258-6156

2 4

Cannot insert node into empty db/collection
by Erdal Karaca 06 Oct '16

06 Oct '16

Hi, When creating an empty database, then trying to insert a node into its root, I get the following error message: Command: create db test XQuery: insert node <test></test> into / Error: [XUDY0027] Insert target is an empty sequence. How can I populate an empty database? - I am using basex 8.5.3. Thanks!

3 5

Get DBPATH variable
by Bram Vanroy 05 Oct '16

05 Oct '16

Hi all, it's me again Another day, another question! I'm still working in Perl on BaseX 7.9. This time I am trying to check if a database is already build. I thought a good way would be to check if the path to the database already exists on the file system. However, not wanting to hard-code each single path for each different basex instance, I was wondering if there is a way to get the DBPATH variable that is set in the .basex file. Note that I need to retrieve this information before opening the database itself: when running a Session, I need to check if a database exists on the DBPATH as specified in that Session's variables. I've been looking in the methods of the BaseX client for Perl, and in the available commands on the wiki but I cannot find a way to retrieve these 'Session Globals'. Is there a way? Or any other way to check if the database already exists? Thank you in advance Bram

2 1

Content is not allowed in prolog
by Bram Vanroy 04 Oct '16

04 Oct '16

Hi all This error has been handled with a lot, but always concerns CSV. I am dealing with simple XML. I am writing a Perl script that first generates a XML file, and then imports it into a BaseX database. Unfortunately, I get the error message: "." (Line 1): Content is not allowed in prolog. At /BaseXClient.pm line 126 I have tried many things and have been debugging with perl, but as far as I can see the created files are valid XML. The error implies that a connection to the BaseX server is established. Something's wrong with the XML file but I do not know what and how to prevent it. I added the script on pastebin as to not waste space in this email. [1] The XML is created in the sub createXml. That routine returns the path to the created file, which on line 24 is imported into BaseX. Or at least, that is the goal. But that's where the error occurs. I attached example XML output. The script as well as the output and input are in UTF8. Thank you in advance Kind regards Bram Vanroy [1]: http://pastebin.com/MhA8eBJf

2 4

One database instance per user
by Erdal Karaca 01 Oct '16

01 Oct '16

Hi, I intend to use one database for each user of the business domain (web application). Does anyone have experiences with lots of 'small' databases vs. one 'big' database regarding performance/scalability/stability? Thanks! Best regards, Erdal

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BaseX-Talk October 2016