Hi Peter, 2016-09-01 10:26 GMT-03:00 PBKResearch <pe...@pbkresearch.co.uk>:
> Hello > > > > I am using XPath as a way of dissecting web pages, especially from > Wiktionary. > Any specific reason to not use the SPARQL endpoint? > Generally I get good results, but I could get useful extra flexibility by > using the binary Smalltalk operators to represent XPath, as mentioned at > the end of the class comment for XPath. However, the description there is > very terse, and I am having difficulty seeing how to include more complex > expressions, especially attribute tests. > Which XPath version are you using? How did you installed it? > I have put some of my XPath expressions through the XPath compiler and > looked at the output, and out of that I have found expressions which work > but look very clumsy. As an example, I have used the fragment: > > > > document xPath: '//div[@id=''catlinks'']//li//text()' > > > > and found that an equivalent is: > > > > document //'div' ?? [:node :x :y|(node attributeAt: 'id') = > 'catlinks']//'li'//[:n| n isStringNode]]. > > (I had to put two dummy arguments in the three-argument block to get it to > work.) > > > > Is there a more extensive explanation of the use of these binary > operators? If not, could some kind person show me the most concise > translation of the sample XPath above, to give me a start in working out > more complex cases? > > > > Many thanks for any help. > > > > Peter Kenny > > >
