Api for XML

There are various api for accessing xml documents. They are the following-

• Stream oriented api: Simple api for xml or SAX, it is event based.
• Tree traversal api: Dom is a tree-traversal api. DOM implementation is memory intensive, as it loads the whole xml tree before accessing data.
• Xml data binding: which is a automated way to convert XML document.
• Declarative transformation languages: XSLT, XQuery.
  

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xml vs database

XML can be used as databases. But the question is that why should I use it or why should I avoid it? XML has the properties of storage, portability, schemas. Xml is self describing means the elements, attributes tells what the data it contains. It also describes data in tree or graph structure.
Xml provides many qualities of databases.
1. Storage: Xml documents.
2. Schemas: DTDs, Xml schemas.
3. Query languages: Xpath, Xquery.
4. Programming interfaces: SAX, DOM.
And it also lacks some of the cool features of databases.
1. Security.
2. Integrity.
3. Indexes.
4. Transaction.
5. Efficient storage.
6. Multi user access.
7. Triggers.
8. Queries across multiple documents.
So, xml can be used as a database for few users, small amount of data. But for product environment where there will larger data, huge user, need data integrity, there needs databases. So, there is very little advantage to use xml as a database.

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3. Fine Search v.1.0 - Improves Opencart search feature to find relevant: Find it here.
4. Opensweetcaptcha - An easy way to generate attractive captcha for your system!: Find it here.
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xpath query in php

Lets see the zend mock php 5 certification question on xpath.

Question:

Consider the following simple PHP script:


$dom = new DomDocument();
$dom->load('test.xml');
$xpath = new DomXPath($dom);
$nodes = $xpath->query(???????, $dom->documentElement);
echo $nodes->item(0)->getAttributeNode('bgcolor')->value
. "\n";

What XPath query should go in the ?????? above to display the "bgcolor" attribute of the first "body" node in the XML document?


Answer:

1. "*[local-name()='body']"
2. "/body[0]/text"
3. "/body/body[0]"
4. "name='body'"
I am not sure about this. my answer is this.
5. "*[lname()='body']"
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4. Opensweetcaptcha - An easy way to generate attractive captcha for your system!: Find it here.
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output xml string

The asXml([string filename]) returns a well-formed xml string to the output. If a filename is specified then it is written to the file.


Question:

Given the following PHP script:



$xmldata = XML
?xml version="1.0" encoding="ISO-8859-1" ?
!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
head
title XML Example/title
/head
body
p
b Hello, World! /b
/p
/body
/html
XML;

$sxe = simplexml_load_string($xmldata);

$p = $sxe->body->p;

$string = ????????

print $string;



What should go in place of ????? above to print the string Hello, World! (with no leading/trailing whitespace or markup)?


Answer:

1. trim(($p[1]));
2. trim(strip_tags(($p->asText())));
There is no such function named asText()
3. trim(strip_tags(($p->asXML())));
4. trim(($p->asXML()));
5. strip_tags(($p->asXML()));
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Opencart Extensions:

1. Product Based Quantity Wise Shipping: Find it here.
2. OpenSSLCOMMERZ: integrate SSLCOMMERZ with opencart: Find it here.
3. Fine Search v.1.0 - Improves Opencart search feature to find relevant: Find it here.
4. Opensweetcaptcha - An easy way to generate attractive captcha for your system!: Find it here.
5. Custom Field Product - add unlimited custom fields to the product form: Find it here.
6. Formcaptcha - add captcha on the register page: Find it here.

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xml dtd

Question:

What XML technology is used when you mix two different document types in a single XML document?

Answer:

1. Validators
2. DTD
DTD describes the document type definition of a xml document.
3. Transformations
4. Namespaces
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1. Real-Time Health Data from Every Where:WP plugin to display real-time health data & increase sale by promoting user specific products according to health information: garazlab.com.
2. Woocommerce Stock Notification Builder:Sends desktop, mobile & email notifications with full customization.Build your own product notification system with it: garazlab.com.

Opencart Extensions:

1. Product Based Quantity Wise Shipping: Find it here.
2. OpenSSLCOMMERZ: integrate SSLCOMMERZ with opencart: Find it here.
3. Fine Search v.1.0 - Improves Opencart search feature to find relevant: Find it here.
4. Opensweetcaptcha - An easy way to generate attractive captcha for your system!: Find it here.
5. Custom Field Product - add unlimited custom fields to the product form: Find it here.
6. Formcaptcha - add captcha on the register page: Find it here.

My Books:

1. OpenCart 1.4 Template Design Cookbook.
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xml question

The following is question regarding xml. I am not sure of the answers.

Question:

Consider the following example XML document:

?xml version="1.0" encoding="ISO-8859-1" ?
!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
head
title XML Example /title
/head
body
p
Moved to a href="http://example.org/" http://www.example.org//a.
br
/p
/body
/html
What is wrong with this document, and how can it be corrected?


Answer: (choose 2)

1. The document is completely valid
2. All special XML characters must be represented as entities within the content of a node
3. All tags must be closed
4. You cannot specify a namespace for the html attribute
This is not right. one can specify a namespace for the html attribute.
5. The DOCTYPE declaration is malformed
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Technical Support:

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Wordpress Plugins:

1. Real-Time Health Data from Every Where:WP plugin to display real-time health data & increase sale by promoting user specific products according to health information: garazlab.com.
2. Woocommerce Stock Notification Builder:Sends desktop, mobile & email notifications with full customization.Build your own product notification system with it: garazlab.com.

Opencart Extensions:

1. Product Based Quantity Wise Shipping: Find it here.
2. OpenSSLCOMMERZ: integrate SSLCOMMERZ with opencart: Find it here.
3. Fine Search v.1.0 - Improves Opencart search feature to find relevant: Find it here.
4. Opensweetcaptcha - An easy way to generate attractive captcha for your system!: Find it here.
5. Custom Field Product - add unlimited custom fields to the product form: Find it here.
6. Formcaptcha - add captcha on the register page: Find it here.

My Books:

1. OpenCart 1.4 Template Design Cookbook.
2. Joomla Mobile Development Beginners Guide