README

README - 2011-11-19
-------------------


INTRODUCTION

    This README file describes the microxml library version 1.0.

    microxml is a small XML parsing library that you can use to read XML and
    XML-like data files in your application without requiring large non-standard
    libraries.  microxml only requires an ANSI C compatible compiler (GCC works,
    as do most vendors' ANSI C compilers) and a "make" program.

    microxml provides the following functionality:

	- Reading of UTF-8 and UTF-16 and writing of UTF-8 encoded XML files and
	  strings.
	- Data is stored in a linked-list tree structure, preserving the XML
	  data hierarchy.
	- Supports arbitrary element names, attributes, and attribute values
	  with no preset limits, just available memory.
	- Supports integer, real, opaque ("cdata"), and text data types in
	  "leaf" nodes.
	- Functions for creating and managing trees of data.
	- "Find" and "walk" functions for easily locating and navigating trees
	  of data.

    microxml doesn't do validation or other types of processing on the data
    based upon schema files or other sources of definition information.


BUILDING microxml

    microxml comes with an autoconf-based configure script; just type the
    following command to get things going:

        ./configure

    The default install prefix is /usr/local, which can be overridden using the
    --prefix option:

        ./configure --prefix=/foo

    Other configure options can be found using the --help option:

        ./configure --help

    Once you have configured the software, type "make" to do the build and run
    the test program to verify that things are working, as follows:

        make

    If you are using microxml under Microsoft Windows with Visual C++ 2008, use
    the included project files in the "vcnet" subdirectory to build the library
    instead.


INSTALLING microxml

    The "install" target will install microxml in the lib and include
    directories:

        make install

    Once you have installed it, use the "-lmicroxml" option to link your application
    against it.


    microxml provides a single header file which you include:

        #include <microxml.h>

    Nodes are defined by the "mxml_node_t" structure; the "type" member defines
    the node type (element, integer, opaque, real, or text) which determines
    which value you want to look at in the "value" union.  New nodes can be
    created using the "mxmlNewElement()", "mxmlNewInteger()", "mxmlNewOpaque()",
    "mxmlNewReal()", and "mxmlNewText()" functions.  Only elements can have
    child nodes, and the top node must be an element, usually "?xml".

    You load an XML file using the "mxmlLoadFile()" function:

        FILE *fp;
        mxml_node_t *tree;

	fp = fopen("filename.xml", "r");
	tree = mxmlLoadFile(NULL, fp, MXML_NO_CALLBACK);
	fclose(fp);

    Similarly, you save an XML file using the "mxmlSaveFile()" function:

        FILE *fp;
        mxml_node_t *tree;

	fp = fopen("filename.xml", "w");
	mxmlSaveFile(tree, fp, MXML_NO_CALLBACK);
	fclose(fp);

    The "mxmlLoadString()", "mxmlSaveAllocString()", and "mxmlSaveString()"
    functions load XML node trees from and save XML node trees to strings:

        char buffer[8192];
	char *ptr;
	mxml_node_t *tree;

        ...
	tree = mxmlLoadString(NULL, buffer, MXML_NO_CALLBACK);

        ...
        mxmlSaveString(tree, buffer, sizeof(buffer), MXML_NO_CALLBACK);

        ...
	ptr = mxmlSaveAllocString(tree, MXML_NO_CALLBACK);

    You can find a named element/node using the "mxmlFindElement()" function:

        mxml_node_t *node = mxmlFindElement(tree, tree, "name", "attr",
	                                    "value", MXML_DESCEND);

    The "name", "attr", and "value" arguments can be passed as NULL to act as
    wildcards, e.g.:

        /* Find the first "a" element */
        node = mxmlFindElement(tree, tree, "a", NULL, NULL, MXML_DESCEND);

        /* Find the first "a" element with "href" attribute */
        node = mxmlFindElement(tree, tree, "a", "href", NULL, MXML_DESCEND);

        /* Find the first "a" element with "href" to a URL */
        node = mxmlFindElement(tree, tree, "a", "href",
	                       "http://www.minixml.org/",
			       MXML_DESCEND);

        /* Find the first element with a "src" attribute*/
        node = mxmlFindElement(tree, tree, NULL, "src", NULL, MXML_DESCEND);

        /* Find the first element with a "src" = "foo.jpg" */
        node = mxmlFindElement(tree, tree, NULL, "src", "foo.jpg",
	                       MXML_DESCEND);

    You can also iterate with the same function:

        mxml_node_t *node;

	for (node = mxmlFindElement(tree, tree, "name", NULL, NULL,
	                            MXML_DESCEND);
	     node != NULL;
	     node = mxmlFindElement(node, tree, "name", NULL, NULL,
	                            MXML_DESCEND))
        {
	  ... do something ...
	}

    The "mxmlFindPath()" function finds the (first) value node under a specific
    element using a "path":

        mxml_node_t *value = mxmlFindPath(tree, "path/to/*/foo/bar");

    The "mxmlGetInteger()", "mxmlGetOpaque()", "mxmlGetReal()", and
    "mxmlGetText()" functions retrieve the value from a node:

        mxml_node_t *node;

        int intvalue = mxmlGetInteger(node);

        const char *opaquevalue = mxmlGetOpaque(node);

        double realvalue = mxmlGetReal(node);

        int whitespacevalue;
        const char *textvalue = mxmlGetText(node, &whitespacevalue);

    Finally, once you are done with the XML data, use the "mxmlDelete()"
    function to recursively free the memory that is used for a particular node
    or the entire tree:

        mxmlDelete(tree);


GETTING HELP AND REPORTING PROBLEMS

    TODO

LEGAL STUFF

    The Mini-XML library is Copyright 2003-2011 by Michael Sweet.  License terms
    are described in the file "COPYING".

    The microxml library is Copyright 2011-2012 by Luka Perkov.  License terms
    are described in the file "COPYING".