Parsing is the operation that the server performs to convert an XML document (a string) into an XML node whose elements can be addressed and extracted by services. Integration Server automatically parses XML documents that you fetch with the pub.xml:loadXMLNode service.

A node is the result of a parsing operation. It is an element-based representation of an XML document. The node expresses a document in a tree-like structure that allows the data within it to be efficiently addressed and linked into services.

A query is an expression, written in either the XML Query Language (XQL) or the webMethods Query Language (WQL) that you use to extract (filter) information from XML nodes.

WQL (webMethods Query Language) is a language that is used to retrieve information from an HTML or XML document. For more information about WQL, see webMethods Query Language.

XQL (XML Query Language) is a language that is used to retrieve information from an XML document.