Как получить xPath элемента

Я пытаюсь получить значение атрибута data-content_published_date, который является датой публикации статьи с помощью xPath, но по какой-то причине я не могу!

Вот как я пытался:

//div[@id='page-segment-values']/@data-content_published_date

А вот тег div:

<div id = "page-segment-values" class = "">
  <div class = "keyvals" data-content_author_name = "Eli Meixler" data-content_cms_id = "5461956" data-content_headline = "British Academic" data-content_modified_date = "" data-content_published_date = "2018-11-22T08:15:43.000Z" data-content_shown_on_platform = "own" data-content_type = "article" data-path = "/5461956/british-academic-sentenced-spying-united-arab-emirates/" data-referrer = "" data-search = "" data-content_is_post = "post" data-title = "A British Academic Has Been Sentenced to Life in Prison on Espionage Charges in the United Arab Emirates" data-affiliate_link_count = "0" data-content_cms_category = "World" data-content_cms_tags = "onetime|overnight|United Arab Emirates" data-content_cms_terms = "World,onetime,overnight,United Arab Emirates" data-time_inc_brand = "time.com" data-time_inc_application = "front end" data-content_syndicated = "false" data-content_syndicated_brand = "" data-content_syndicated_url = "" data-content_nlp_sentiment_label = "negative" data-content_nlp_sentiment_score = "-0.2" data-content_nlp_sentiment_magnitude = "5.9" data-content_nlp_entities = "Matthew Hedges" data-content_nlp_payload = "{&quot;entities&quot;:[{&quot;type&quot;:&quot;PERSON&quot;,&quot;text&quot;:&quot;Matthew Hedges&quot;,&quot;relevance&quot;:0.57477295,&quot;disambiguation&quot;:{}},{&quot;type&quot;:&quot;WORK_OF_ART&quot;,&quot;text&quot;:&quot;British Academic Sentenced to Life on Spying Charges&quot;,&quot;relevance&quot;:0.02937225,&quot;disambiguation&quot;:{}},{&quot;type&quot;:&quot;LOCATION&quot;,&quot;text&quot;:&quot;British&quot;,&quot;relevance&quot;:0.029201617,&quot;disambiguation&quot;:{&quot;mid&quot;:&quot;/m/07ssc&quot;,&quot;wikipedia_url&quot;:&quot;https://en.wikipedia.org/wiki/United_Kingdom&quot;}},{&quot;type&quot;:&quot;PERSON&quot;,&quot;text&quot;:&quot;academic&quot;,&quot;relevance&quot;:0.020707963,&quot;disambiguation&quot;:{}},{&quot;type&quot;:&quot;OTHER&quot;,&quot;text&quot;:&quot;life&quot;,&quot;relevance&quot;:0.018888554,&quot;disambiguation&quot;:{}},{&quot;type&quot;:&quot;OTHER&quot;,&quot;text&quot;:&quot;spying charges&quot;,&quot;relevance&quot;:0.013851213,&quot;disambiguation&quot;:{}},{&quot;type&quot;:&quot;LOCATION&quot;,&quot;text&quot;:&quot;prison&quot;,&quot;relevance&quot;:0.0133453375,&quot;disambiguation&quot;:{}},{&quot;type&quot;:&quot;LOCATION&quot;,&quot;text&quot;:&quot;United Arab Emirates&quot;,&quot;relevance&quot;:0.011457251,&quot;disambiguation&quot;:{&quot;wikipedia_url&quot;:&quot;https://en.wikipedia.org/wiki/United_Arab_Emirates&quot;,&quot;mid&quot;:&quot;/m/0j1z8&quot;}},{&quot;type&quot;:&quot;OTHER&quot;,&quot;text&quot;:&quot;threats&quot;,&quot;relevance&quot;:0.009783207,&quot;disambiguation&quot;:{}},{&quot;type&quot;:&quot;EVENT&quot;,&quot;text&quot;:&quot;blowback&quot;,&quot;relevance&quot;:0.009783207,&quot;disambiguation&quot;:{}}],&quot;categories&quot;:[{&quot;label&quot;:&quot;/Law &amp; Government/Public Safety/Crime &amp; Justice&quot;,&quot;score&quot;:0.64}],&quot;docSentiment&quot;:{&quot;magnitude&quot;:5.9,&quot;score&quot;:-0.2,&quot;label&quot;:&quot;negative&quot;},&quot;language&quot;:&quot;en&quot;}" data-content_nlp_categories = "/Law &amp; Government/Public Safety/Crime &amp; Justice"></div>
</div>

Кто-нибудь знает, почему я не могу получить доступ к его значению? И как его получить?