Counts the number of elements that can be found by the specified Element Location Path interpreted against the specified context element.

This function returns the same result as the following call:


findElementsByLPath(element, lpath, ...).count()
However, it will work faster.

Parameters:

element

The context element against which the Location Path is to be interpreted.

If this parameter is not specified, the Location Path will be interpreted against the generator context element, which is the same as the call: contextElement.countElementsByLPath(lpath)

See Also: GOMContext.contextElement

lpath
The Location Path expression specifying how the elements should be searched (see "What are Location Paths?" below).

You may use the Location Path Builder (found at the left panel's tree) to quickly construct a Location Path needed for this parameter.

filterQuery
This parameter allows you to specify a direct filtering condition on the counted elements.

When specified, this should be a boolean subquery created with BooleanQuery() function. The subquery will be processed against each initially selected element and should return true if the element must be counted and false otherwise. The tested element is passed to the subquery as the generator context element.

Note: The null value in this parameter will mean that no filtering condition is specified.

uniqueKeyQuery
This parameter allows you to specify a different method of filtering the counted elements -- by unique keys -- which will work in addition to the direct filtering specified with the filterQuery parameter (above).

When specified, this should be a subquery created with FlexQuery() function. The subquery will be executed for each tested element (initially passed the filterQuery condition) to generate a certain key associated with that element. The elements whose keys are repeating will be excluded from the counting.

The tested element is passed to the subquery as the generator context element. The value returned by the subquery should be an object good to be a hash key. The null value is also allowed.

Note: The null value in this parameter will be treated as no filtering by keys is specified.

Note: When you need to filter elements by several keys with different types so that only the whole set of keys generated for each element must be unique, you can do it by creating a single compound filtering key using HashKey() function.

Returns:

The number of counted elements.

See Also:

findElementsByLPath(), checkElementsByLPath(), countElementsByLRules(), HashKey()

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