Evan Lenz, Author at MarkLogic

Tutorial

Introducing the simple mapping operator (!)

The simple mapping operator (!), a feature of XQuery 3.0, promises to transform the face of XQuery programming style. Check it out.

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Comparison Operators in XQuery: What’s the difference between “eq” and “=”?

XQuery has these 12 comparison operators: eq, ne, lt, gt, le, ge, =, !=, , =. Isn't that about 6 too many?

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Warning: name() is a code smell

Namespace-related bugs are a pain in the neck. You can avoid a large class of them by pretending that the name() function never existed (and avoid using it).

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Warning: text() is a code smell

Do you use the text() node test a lot? You may need to get help. Fortunately, you need look no further than this article.

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Controlling Output Options

How do you control how your query or stylesheet results will be serialized (encoding, indentation, etc.)? There are several options for controlling output options.

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“Fragment”-ed thoughts

What is meant by the term "fragment" in MarkLogic? How is it different from a "document"? Are there different kinds of fragments?

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Using namespace wildcards in XPath

Namespace wildcards are handy shortcuts -- sometimes. But more often than not they should be avoided. Read more to learn why.

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Searching with constraints and facets

Learn how MarkLogic's Search API made it easy to implement faceted search for an example website.

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To “fn” or not to “fn”

Should you use the "fn:" prefix when calling the built-in XQuery functions? This post discusses the pros and cons.

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Learning with xdmp:query-trace()

The xdmp:query-trace() function is a useful tool in helping to understand how MarkLogic evaluates queries. Why does a query run fast or slow?

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Evan Lenz