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Libxml2 set of examples

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The examples are stored per section depending on the main focus of the example:

  • xmlWriter :

  • InputOutput :

    • io1.c: Example of custom Input/Output
    • io2.c: Output to char buffer

  • Tree :

    • tree1.c: Navigates a tree to print element names
    • tree2.c: Creates a tree

  • XPath :

    • xpath1.c: Evaluate XPath expression and prints result node set.
    • xpath2.c: Load a document, locate subelements with XPath, modify said elements and save the resulting document.

  • Parsing :

    • parse1.c: Parse an XML file to a tree and free it
    • parse2.c: Parse and validate an XML file to a tree and free the result
    • parse3.c: Parse an XML document in memory to a tree and free it
    • parse4.c: Parse an XML document chunk by chunk to a tree and free it

  • xmlReader :

    • reader1.c: Parse an XML file with an xmlReader
    • reader2.c: Parse and validate an XML file with an xmlReader
    • reader3.c: Show how to extract subdocuments with xmlReader
    • reader4.c: Parse multiple XML files reusing an xmlReader

Getting the compilation options and libraries dependancies needed to generate binaries from the examples is best done on Linux/Unix by using the xml2-config script which should have been installed as part of make install step or when installing the libxml2 development package:

gcc -o example `xml2-config --cflags` example.c `xml2-config --libs`

InputOutput Examples

io1.c: Example of custom Input/Output

Demonstrate the use of xmlRegisterInputCallbacks to build a custom I/O layer, this is used in an XInclude method context to show how dynamic document can be built in a clean way.

Includes:

Uses:

Usage:

io1

Author: Daniel Veillard

io2.c: Output to char buffer

Demonstrate the use of xmlDocDumpMemory to output document to a character buffer

Includes:

Uses:

Usage:

io2

Author: John Fleck

Parsing Examples

parse1.c: Parse an XML file to a tree and free it

Demonstrate the use of xmlReadFile() to read an XML file into a tree and and xmlFreeDoc() to free the resulting tree

Includes:

Uses:

Usage:

parse1 test1.xml

Author: Daniel Veillard

parse2.c: Parse and validate an XML file to a tree and free the result

Create a parser context for an XML file, then parse and validate the file, creating a tree, check the validation result and xmlFreeDoc() to free the resulting tree.

Includes:

Uses:

Usage:

parse2 test2.xml

Author: Daniel Veillard

parse3.c: Parse an XML document in memory to a tree and free it

Demonstrate the use of xmlReadMemory() to read an XML file into a tree and and xmlFreeDoc() to free the resulting tree

Includes:

Uses:

Usage:

parse3

Author: Daniel Veillard

parse4.c: Parse an XML document chunk by chunk to a tree and free it

Demonstrate the use of xmlCreatePushParserCtxt() and xmlParseChunk() to read an XML file progressively into a tree and and xmlFreeDoc() to free the resulting tree

Includes:

Uses:

Usage:

parse4 test3.xml

Author: Daniel Veillard

Tree Examples

tree1.c: Navigates a tree to print element names

Parse a file to a tree, use xmlDocGetRootElement() to get the root element, then walk the document and print all the element name in document order.

Includes:

Uses:

Usage:

tree1 filename_or_URL

Author: Dodji Seketeli

tree2.c: Creates a tree

Shows how to create document, nodes and dump it to stdout or file.

Includes:

Uses:

Usage:

tree2 <filename> -Default output: stdout

Author: Lucas Brasilino <brasilino@recife.pe.gov.br>

XPath Examples

xpath1.c: Evaluate XPath expression and prints result node set.

Shows how to evaluate XPath expression and register known namespaces in XPath context.

Includes:

Uses:

Usage:

xpath1 <xml-file> <xpath-expr> [<known-ns-list>]

Author: Aleksey Sanin

xpath2.c: Load a document, locate subelements with XPath, modify said elements and save the resulting document.

Shows how to make a full round-trip from a load/edit/save

Includes:

Uses:

Usage:

xpath2 <xml-file> <xpath-expr> <new-value>

Author: Aleksey Sanin and Daniel Veillard

xmlReader Examples

reader1.c: Parse an XML file with an xmlReader

Demonstrate the use of xmlReaderForFile() to parse an XML file and dump the informations about the nodes found in the process. (Note that the XMLReader functions require libxml2 version later than 2.6.)

Includes:

Uses:

Usage:

reader1 <filename>

Author: Daniel Veillard

reader2.c: Parse and validate an XML file with an xmlReader

Demonstrate the use of xmlReaderForFile() to parse an XML file validating the content in the process and activating options like entities substitution, and DTD attributes defaulting. (Note that the XMLReader functions require libxml2 version later than 2.6.)

Includes:

Uses:

Usage:

reader2 <valid_xml_filename>

Author: Daniel Veillard

reader3.c: Show how to extract subdocuments with xmlReader

Demonstrate the use of xmlTextReaderPreservePattern() to parse an XML file with the xmlReader while collecting only some subparts of the document. (Note that the XMLReader functions require libxml2 version later than 2.6.)

Includes:

Uses:

Usage:

reader3

Author: Daniel Veillard

reader4.c: Parse multiple XML files reusing an xmlReader

Demonstrate the use of xmlReaderForFile() and xmlReaderNewFile to parse XML files while reusing the reader object and parser context. (Note that the XMLReader functions require libxml2 version later than 2.6.)

Includes:

Uses:

Usage:

reader4 <filename> [ filename ... ]

Author: Graham Bennett

xmlWriter Examples

testWriter.c: use various APIs for the xmlWriter

tests a number of APIs for the xmlWriter, especially the various methods to write to a filename, to a memory buffer, to a new document, or to a subtree. It shows how to do encoding string conversions too. The resulting documents are then serialized.

Includes:

Uses:

Usage:

testWriter

Author: Alfred Mickautsch

Daniel Veillard