barcode generator vb.net free XPath in Software

Paint PDF417 in Software XPath

XPath
PDF-417 2d Barcode Reader In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
PDF417 Maker In None
Using Barcode maker for Software Control to generate, create PDF-417 2d barcode image in Software applications.
The full XPointer syntax is built on the W3C XPath recommendation. XPath was originally built to be used by XPointer and XSLT (a language for transforming XML documents into other XML documents), but it has found application in other standards and technologies. We will see later how it is used by OpenXML in SQL Server 2000, but first let s examine its syntax. Location steps are constructs used to select nodes in an XML document. They have the following syntax:
Reading PDF-417 2d Barcode In None
Using Barcode decoder for Software Control to read, scan read, scan image in Software applications.
Make PDF-417 2d Barcode In C#.NET
Using Barcode generation for .NET framework Control to generate, create PDF-417 2d barcode image in .NET applications.
axis::node_test[predicate]
PDF-417 2d Barcode Generation In Visual Studio .NET
Using Barcode printer for ASP.NET Control to generate, create PDF 417 image in ASP.NET applications.
Generate PDF 417 In Visual Studio .NET
Using Barcode creation for Visual Studio .NET Control to generate, create PDF417 image in VS .NET applications.
The location step points to the location of other nodes from the position of the current node. If a current node is not specified in any way, the location step is based on the root element. Axes break up the XML document in relation to the current node. You can think of them as a first filter that you apply to an XML document to point to target nodes. Possible axes are listed in Table 12-3.
Make PDF-417 2d Barcode In Visual Basic .NET
Using Barcode encoder for .NET framework Control to generate, create PDF-417 2d barcode image in .NET framework applications.
Generating UCC.EAN - 128 In None
Using Barcode generator for Software Control to generate, create GS1-128 image in Software applications.
12:
Code 128A Generator In None
Using Barcode generator for Software Control to generate, create Code 128 image in Software applications.
Encode Barcode In None
Using Barcode creator for Software Control to generate, create barcode image in Software applications.
XML Support in SQL Server 2000
Encode UPC Code In None
Using Barcode encoder for Software Control to generate, create GS1 - 12 image in Software applications.
ECC200 Drawer In None
Using Barcode generator for Software Control to generate, create Data Matrix ECC200 image in Software applications.
Axes
Draw I-2/5 In None
Using Barcode creation for Software Control to generate, create Interleaved 2 of 5 image in Software applications.
Encode Code 39 In None
Using Barcode maker for Font Control to generate, create Code 39 Extended image in Font applications.
Description
Code 128B Printer In .NET
Using Barcode maker for Reporting Service Control to generate, create Code 128A image in Reporting Service applications.
Decoding UCC - 12 In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
parent ancestor
Code39 Creator In Java
Using Barcode creation for BIRT Control to generate, create USS Code 39 image in BIRT reports applications.
Painting EAN / UCC - 13 In None
Using Barcode generation for Word Control to generate, create EAN-13 image in Microsoft Word applications.
The parent of the current node. All ancestors (parent, grandparent, and so on) to the root of the current node. All children of the current node (first generation). All descendants (children, grandchildren, and so forth) of the current node. The current node only. All descendant nodes and the current node. All ancestor nodes and the current node. All attributes of the current node. All namespace nodes of the current node. All nodes after the current node in the XML document. The set does not include attribute nodes, namespace nodes, or ancestors of the context node. All nodes before the current node in the XML document. The set does not include attribute nodes, namespace nodes, or ancestors of the current node.
GS1 DataBar Encoder In Java
Using Barcode encoder for Java Control to generate, create DataBar image in Java applications.
Encode Bar Code In Visual C#
Using Barcode creation for VS .NET Control to generate, create bar code image in .NET framework applications.
child descendant
self descendant-or-self ancestor-or-self attribute namespace following
preceding
Table 12-3.
Axes in XPath
SQL Server 2000 Stored Procedure Programming
Axes
Description
following-sibling
All siblings (children of the same parent) after the current node in the XML document. All siblings (children of the same parent) before the current node in the XML document.
preceding-sibling
Table 12-3.
Axes in XPath (continued)
The node test is a second filter that you can apply on nodes specified by axes. Table 12-4 list all node tests that can be applied.
Node test
Description
element name * or node() comment() text() processinginstruction()
Selects just node(s) with specified name in the set specified by axes. All nodes in the set specified by axes. All comment elements in the set specified by axes. All text elements in the set specified by axes. All processing instructions elements in the set specified by axes (if the name is specified in brackets, the parser will match only processing instructions with the specified name).
Table 12-4.
Node Tests in XPath
12:
XML Support in SQL Server 2000
A predicate is a filter in the form of a Boolean expression that evaluates each node in the set obtained after applying axes and node test filters. Developers have a rich set of functions (string, node set, Boolean, and number), comparative operators (=, !=, <=, >= <, >), Boolean operators (and, or), and operators (+, , *, div, mod). The list is very long (especially the list of functions), and we will not go into detail here. We will just mention the most common function, position(). It returns the position of the node. Let s now review how all segments of the location step function together.
child::Equipment[position()<=10]
This location set first points to child nodes of the current node (root if none is selected). Of all child nodes, only elements named Equipment are left in the set. Finally, each of those nodes is evaluated by position and only the first 10 are specified. Very often, you will try to navigate from node to node through the XML document. You can attach location sets using the forward slash (/). The same character is often used at the beginning of the expression to establish the current node. In the following example, the parser is pointed to the Inventory.xml file, then to its root element, and then to the first child called Equipment, and finally to the first Model node among its children:
Inventory.xml#/child::Equipment[position() = 1]/child:: Model[position() = 1]
It all works in a very similar fashion to the notation of files and folders, and naturally you can write them all together:
http://www.trigonblue.com/xml/Inventory.xml#/child:: Equipment[position() = 1]/child::Model[position() = 1]
XPath constructs are very flexible, but also very complex and laborious to write. To reduce the effort, a number of abbreviations are defined. position() = X can be replaced by X (it is enough to type just the number). Thus, an earlier example can be written as
Inventory.xml#/child::Equipment[1]/child::Model[1]
Copyright © OnBarcode.com . All rights reserved.