29. The method of claim 25 , further comprising: receiving syntax for a structured-document path-language function; and building a structured-document path-language expression comprising the structured-document path-language addressing syntax and the syntax for the structured-document path-language function.
29. The method of claim 25 , further comprising: receiving syntax for a structured-document path-language function; and building a structured-document path-language expression comprising the structured-document path-language addressing syntax and the syntax for the structured-document path-language function. 31. The method of claim 29 , further comprising presenting information showing a syntactical error in the structured-document path-language expression if the structured-document path-language expression is syntactically incorrect.