In XQuery, you can build an element one of two ways: computed or direct. Direct This is the simpler case, so I’ll take it first. Direct means that your XQuery code has the XML you want to build: declare namespace blog = “http://davidcassel.net/blog”; <blog:example simple=”true”> Â <blog:pointless/> </blog:example> XML is a natural data structure for […]
The team I’m working recently put together a set of coding standards for our XQuery work. This team was generally happy to do so and we came to agreement on a set of standards pretty quickly. The exercise brought to mind a time at a previous company where two of us started discussing aloud whether […]
You may already know that MarkLogic sometimes runs modules as queries (read-only) and updates (read-write). The advantage of queries is that, because they run at a particular timestamp, they don’t need to deal with locks — nothing will change at that timestamp. How does the server know whether a module is a query or an […]
A while ago I was posed a question by a colleague: (1,3,2)[.] -> 1 (1,2,3)[.] -> 1 2 3 (2,3,4)[.] -> no result why? To find the answer, we need to think about what’s happening in the brackets. As discussed in one of my earlier posts, the expression in brackets gets evaluated once for each […]
Another day, another code review. Today I came across a function that generates non-meaningful XML. This is something that at first glance feels like it has a nice structure to it, but there’s a better way. First, let take a look at the XML (I’ve changed the XML and the code to make it anonymous, […]
Today I was looking into some code that was running slower than it should, and I happened across this little tidbit: let $normal :=  try {   xs:int($value)  }  catch($e) {   $value  } Yes, MarkLogic extends XQuery to add try/catch, and this is a tremendously useful feature, when […]
Today I had a complicated function to write. The framework we’re using for this project has unit testing built into it, so for the first time in a long time, I did the Test Driven Development approach: I wrote a set of tests, then wrote code to pass the tests, and then refactored. It felt […]
While looking at the database configuration in MarkLogic Server, have you ever noticed the Word Query link on the left? (Click Configure -> Databases -> the name of one of your databases -> Word Query.) Ever wonder what it does? Word Query is a simple way to specify what parts of a document should be […]
In many search applications, when we show the results of a user’s search, we also want to display the search that was done by putting the query string into a text box, especially if the search is built up from an advanced search screen. In some cases, we might want to modify the search before […]
I recently got to teach the MarkLogic Essentials class for MarkLogic University. To illustrate custom facets, I implemented one on the fly with the class watching. No pressure. :) The good news is that it (almost) worked with the first try — there was just one little problem with the display. This post shows the […]