xmerl_xpath(3)

NAME
xmerl_xpath - The xmerl_xpath module handles the entire XPath 1.0 spec.

DESCRIPTION

The xmerl_xpath module handles the entire XPath 1.0 spec. XPath expressions typically occur in XML attributes and are used to address parts of an XML document. The grammar is defined in xmerl_xpath_parse.yrl. The core functions are defined in xmerl_xpath_pred.erl.

Some useful shell commands for debugging the XPath parser

 c(xmerl_xpath_scan).
 yecc:yecc("xmerl_xpath_parse.yrl", "xmerl_xpath_parse", true, []).
 c(xmerl_xpath_parse).
 xmerl_xpath_parse:parse(xmerl_xpath_scan:tokens("position() > -1")).
 xmerl_xpath_parse:parse(xmerl_xpath_scan:tokens("5 * 6 div 2")).
 xmerl_xpath_parse:parse(xmerl_xpath_scan:tokens("5 + 6 mod 2")).
 xmerl_xpath_parse:parse(xmerl_xpath_scan:tokens("5 * 6")).
 xmerl_xpath_parse:parse(xmerl_xpath_scan:tokens("-----6")).
 xmerl_xpath_parse:parse(xmerl_xpath_scan:tokens("parent::node()")).
 xmerl_xpath_parse:parse(xmerl_xpath_scan:tokens("descendant-or-self::node()")).
 xmerl_xpath_parse:parse(xmerl_xpath_scan:tokens("parent::processing-instruction('foo')")).

DATA TYPES

    docEntity() = #xmlDocument{} | [docNodes()]:

    docNodes() = #xmlElement{} | #xmlAttribute{} | #xmlText{} | #xmlPI{} | #xmlComment{} | #xmlNsNode{}:

    nodeEntity() = #xmlElement{} | #xmlAttribute{} | #xmlText{} | #xmlPI{} | #xmlComment{} | #xmlNsNode{} | #xmlDocument{}:

    option_list() = [{atom(), term()}]:

    parentList() = [{atom(), integer()}]:

    xPathString() = string():

EXPORTS

string(Str, Doc) -> [docEntity()] | Scalar

    Equivalent to string(Str, Doc, []).

string(Str, Doc, Options) -> [docEntity()] | Scalar

    Equivalent to string(Str, Doc, [], Doc, Options).

string(Str, Node, Parents, Doc, Options) -> docEntity() | Scalar

    Types:
        Str = xPathString()
        Node = nodeEntity()
        Parents = parentList()
        Doc = nodeEntity()
        Options = option_list()
        Scalar = #xmlObj{}

    Extracts the nodes from the parsed XML tree according to XPath. xmlObj is a record with fields type and value, where type is boolean | number | string

AUTHORS

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