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Difference Between XQuery and XPath

XQuery vs XPath

XQuery is a functional programming language that is used to query a group of XML data. It is able to manipulate and extract data from either XML documents or relational databases and MS Office documents that support an XML data source. It is a language that helps in creating syntax for new XML documents. XQuery is represented in the form of a tree model with seven nodes, namely processing instructions, elements, document nodes, attributes, namespaces, text nodes, and comments. All values are referred to as sequences. Even a single value is considered as a sequence of length one. The sequence can consist of either nodes or atomic values like integers, strings, or Booleans. It has the following features that are used for the transformation of XML data:

Side effect free.

Logical/physical data independence.

Strongly typed.

High level.

Declarative.

XPath is the XML Path Language that is used for selecting nodes from an XML document using queries. It can also compute values like strings, numbers, or Boolean type from another XML document. The expression in case of XML is known as XPath. It is represented as a tree structure with the ability of XPath to navigate it by selecting different nodes. It was created to define a common syntax and behavior model for XPointer and XSLT. XPath has the following features:

XPath defines the syntax for an XML document.

It has the capability to navigate path expressions in XML documents.

It has its own library defining standard functions.

It is a major component of XSLT.

Other differences between XPath and XQuery:

1. XPath is viewed as a regular expression whereas XQuery is like a C-programming language w.r.t. XML documents.

2. XPath is a filter for an XML dataset and is the transformational component of XSLT. XQuery is used to select several nodes from an XML document for the purpose of processing using different queries.

3. XQuery uses XPath syntax for addressing different parts of an XML document. The joins are performed using the FLWOR expression. This expression has five clauses, namely, WHERE, ORDER BY, FOR, LET, and RETURN.

Summary:

1. XPath is still in its nascent stage of development and as such is still a component of a query language.

2. XQuery supports XPath and extended relational models.

3. XQuery is a read-only language that is not very easy to formulate.

4. XQuery is not a standard and is difficult to optimize leading to poor performance.


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