‏‏פעולת צעד חייבת לכלול בדיקת צמתים או, במקרה של פרדיקאט, ביטוי אלגבראי אשר לעומתו ניתן להעריך את הבדיקה של כל צומת בערכת הצמתים המזוהה על-ידי ערכת הצמתים הקודמת.

Message in Hebrew (עברית)

Unlocalized message

A step operation must involve either a node test or, in the case of a predicate, an algebraic expression against which to test each node in the node set identified by the preceeding node set can be evaluated.

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