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Oracle® XML API Reference
10g Release 1 (10.1)
Part No. B10789-01
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XPath Interface

Table 10-1 summarizes the methods of available through the XPath interface.

Table 10-1 Summary of XPath Methods

Function Summary
XmlXPathCreateCtx
Create an XPath context.
XmlXPathDestroyCtx
Destroy an XPath context.
XmlXPathEval
Evaluate XPath expression.
XmlXPathGetObjectBoolean
Get boolean value of XPath object.
XmlXPathGetObjectFragment
Get fragment value of XPath object.
XmlXPathGetObjectNSetNode
Get node from nodeset type XPath object.
XmlXPathGetObjectNSetNum
Get number of nodes in nodeset type XPath object.
XmlXPathGetObjectNumber
Get number from XPath object.
XmlXPathGetObjectString
Get string from XPath object.
XmlXPathGetObjectType
Get XPath object type.
XmlXPathParse
Parse XPath expression.


XmlXPathCreateCtx

Create an XPath context


Syntax
xpctx* XmlXPathCreateCtx(
   xmlctx *xsl,
   oratext *baseuri,
   xmlnode *ctxnode, 
   ub4 ctxpos, 
   ub4 ctxsize);

Parameter In/Out Description
xsl
IN
XSL stylesheet as xmldoc object
baseuri
IN
base URI used by document, if any
ctxnode
IN
current context position
ctxpos
IN
current context size
ctxsize
IN
current context node


Returns

(xpctx *) XPath context or NULL on error


XmlXPathDestroyCtx

Destroy an XPath context.


Syntax
void XmlXPathDestroyCtx(
   xpctx *xslxpctx);

Parameter In/Out Description
xslxpctx
IN
XPath context object


XmlXPathEval

Evaluate XPath expression.


Syntax
xpobj *XmlXPathEval(
   xpctx *xctx, 
   xpexpr *exprtree, 
   xmlerr *err);

Parameter In/Out Description
xctx
IN
XPath context
exprtree
IN
parsed XPath expression tree
err
OUT
error code


Returns

(xpobj *) result XPath object or NULL on error


XmlXPathGetObjectBoolean

Get boolean value of XPath object


Syntax
boolean XmlXPathGetObjectBoolean(
   xpobj *obj);

Parameter In/Out Description
obj
IN
XPath object


Returns

(boolean) truth value


XmlXPathGetObjectFragment

Get boolean value of XPath object


Syntax
xmlnode* XmlXPathGetObjectFragment(
   xpobj *obj);

Parameter In/Out Description
obj
IN
XPath object


Returns

(boolean) truth value


XmlXPathGetObjectNSetNode

Get node from nodeset-type XPath object


Syntax
xmlnode *XmlXPathGetObjectNSetNode(
   xpobj *obj,
   ub4 i);

Parameter In/Out Description
obj
IN
XPath object
i
IN
node index in nodeset


Returns

(xmlnode *) The object type or values.


XmlXPathGetObjectNSetNum

Get number of nodes in nodeset-type XPath object


Syntax
ub4 XmlXPathGetObjectNSetNum(
   xpobj *obj);

Parameter In/Out Description
obj
IN
XPath object


Returns

(ub4) number of nodes in nodeset


XmlXPathGetObjectNumber

Get number from XPath object


Syntax
double XmlXPathGetObjectNumber(
   xpobj *obj);

Parameter In/Out Description
obj
IN
XPath object


Returns

(double) number


XmlXPathGetObjectString

Get string from XPath object


Syntax
oratext *XmlXPathGetObjectString(
   xpobj *obj);

Parameter In/Out Description
obj
IN
XPath object


Returns

(oratext *) string


XmlXPathGetObjectType

Get XPath object type


Syntax
xmlxslobjtype XmlXPathGetObjectType(
   xpobj *obj);

Parameter In/Out Description
obj
IN
XPath object


Returns

(xmlxslobjtype) type-code for object


XmlXPathParse

Parse XPath expression.


Syntax
xpexpr* XmlXPathParse(
   xpctx *xctx,
   oratext *expr,
   xmlerr * err);

Parameter In/Out Description
xctx
IN
XPath context object
expr
IN
XPath expression
err
OUT
error code


Returns

(xpexpr *) XPath expression parse tree or NULL on error