With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: London was established in the year 43.
text_B: PDF / X is a subset of the PDF ISO standard .. ISO. International Organization for Standardization. PDF. Portable Document Format. The purpose of PDF / X is to facilitate graphics exchange , and it therefore has a series of printing related requirements which do not apply to standard PDF files .. PDF. Portable Document Format. For example , in PDF / X -1 a all fonts need to be embedded and all images need to be CMYK or spot colors .. PDF. Portable Document Format. CMYK. CMYK. PDF / X -3 accepts calibrated RGB and CIELAB colors , while retaining most of the other restrictions of PDF / X -1 a.. PDF. Portable Document Format. calibrated. Color management. RGB. RGB. CIELAB. CIELAB. PDF / X files must not only follow certain restrictions , they also must contain a special file identification , inside the PDF , which says which PDF / X version they are .. PDF. Portable Document Format. This means that a file can only conform to a single specific PDF / X standard , even if all other requirements are met .. PDF. Portable Document Format. The printing conditions or output intent need to be specified in the file .. This can be specified in the form of standard profiles using codes , like `` CGATS TR 001 SWOP '' .. SWOP. Specifications for Web Offset Publications. In a PDF / X file that has color managed data each color managed graphic gets its own color profile , so even though the file as a whole is CMYK , individual graphics may be RGB -LRB- with calibration information -RRB- .. PDF. Portable Document Format. CMYK. CMYK. RGB. RGB. Various boxes must be defined .. The MediaBox which defines the size of the entire document , either the ArtBox or the TrimBox , which define the extent of the printable area .. If the file is to be printed with bleed , a BleedBox , which must be larger than the TrimBox / ArtBox , but smaller than the MediaBox , must be defined .. bleed. Bleed ( printing ). Active content is not allowed in a PDF / X file .. PDF. Portable Document Format. This means that standard PDF features like forms , signatures , comments and embedded sounds and movies are not allowed in PDF / X .. PDF. Portable Document Format. Features that are forbidden in the PDF / X standard can sometimes be used , if they do not affect the rendering of the file .. PDF. Portable Document Format. This allows for things like annotations outside of the BleedBox .. PDF / X -6 is in development which will be the new print production standard built upon PDF 2.0 .. PDF. Portable Document Format
not_related.