What’s “tools:context” in Android layout files?

This is the activity the tools UI editor uses to render your layout preview. It is documented here: This attribute declares which activity this layout is associated with by default. This enables features in the editor or layout preview that require knowledge of the activity, such as what the layout theme should be in the preview … Read more

How to fix error: The markup in the document following the root element must be well-formed

General case The markup in the document following the root element must be well-formed. This error indicates that your XML has markup following the root element. In order to be well-formed, XML must have exactly one root element, and there can be no further markup following the single root element. One root element example (GOOD) The most common sources … Read more

xmlns, xmlns:xsi, xsi:schemaLocation, and targetNamespace?

Namespace related attributes in XML and XML Schema (XSD) xmlns is part of the W3C Namespaces in XML Recommendation:The prefix xmlns is used only to declare namespace bindings and is by definition bound to the namespace name http://www.w3.org/2000/xmlns/.In your example, it declares that http://maven.apache.org/POM/4.0.0 is the default namespace for the elements in your Maven project. xmlns:xsi declares a standard namespace prefix (xsi) for … Read more

XPath: Get parent node from child node

Use the parent axes with the parent node’s name. This XPath will only select the parent node if it is a store. But you can also use one of these These xpaths will select any parent node. So if the document changes you will always select a node, even if it is not the node you expect. EDIT What … Read more

Is XML a programming language?

A programming language? First, XML is a format to represent data. It has originally be designed for this data to be essentially text documents or messages, but nothing prevents you from representing any data you wish, including programs. There at least three big examples of programs expressed in XML that come to mind: XSLT is a Turing-complete language whose only standard format … Read more