Getting started with xpath Finding elements containing specific text Namespaces Select nodes with names equal to or containing some string Find nodes that have a specific attribute Get the count of nodes Location paths and axes Finding elements containing specific attributes Get nodes relative to the current node Select nodes based on their children Check if a node is present Check if a node's text is empty

Check if a node is present

Remarks:

Boolean function has other uses

Check if a string is empty
Check if the argument is not a number (NaN) or is 0

Does the animal have tusks?

XML

<Animal>
    <legs>4</legs>
    <eyes>2</eyes>
    <horns>2</horns>
    <tail>1</tail>
</Animal>

XPATH

boolean(/Animal/tusks)

OUTPUT

false

Does the animal have horns?

XPATH

<Animal>
    <legs>4</legs>
    <eyes>2</eyes>
    <horns>2</horns>
    <tail>1</tail>
</Animal>

XPATH

boolean(/Animal/horns)

OUTPUT

true

Are there plants in the house?

XML

<House>
    <LivingRoom>
        <plant name="rose"/>
    </LivingRoom>
    <TerraceGarden>
        <plant name="passion fruit"/>
        <plant name="lily"/>
        <plant name="golden duranta"/>
    </TerraceGarden>
</House>

XPATH

boolean(/House//plant)

OUTPUT

true

Syntax:

boolean(path_to_node)

Contributors

Topic Id: 7432

Example Ids: 24591,24592,24593

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