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The binary parts of the original XML infoset are extracted out, leaving an "XOP Infoset" (which is essentially the original XML Infoset with the binary parts replaced by external references). The references in the XOP Infoset are represented using the "xop:Include" element. The XOP Infoset plus the
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can be used as a packaging mechanism. When used with MIME, the XOP Infoset is represented as XML in the root MIME part, and the binary chunks are represented in the other MIME parts. Those other MIME parts can be serialized as binary data, avoiding the need to base64 encode them if they were left
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Therefore, XOP can reduce the size of the serialization (since base64 encoding has approximately a 33% size overhead) and (depending on how it is implemented) might allow processing efficiencies. This size increase results in extra resources needed to transmit or store the data.
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XOP allows the binary data part of an XML Infoset to be serialized without going through the XML serializer. The XML serialization of an XML Infoset is text based, so any binary data will need to be encoded using
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52:. Using XOP avoids this by extracting the binary data out of the XML Infoset so that the XML Infoset does not contain binary data and the binary data can be serialized differently.
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To reconstitute the XML Infoset, the XOP Package is deserialized into the XOP Infoset plus the extracted content, and then the extracted content is put back into the XML Infoset.
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The representation of the XOP packages introduces some overhead. These are negligible when the binary data is large, but could be significant if the binary data is small.
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XOP can be used with a number of different packaging mechanisms. A packaging mechanism defines how the XOP Infoset and the binary chunks are represented.
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extracted content can be serialized into a representation called the "XOP Package". The XOP Package can be sent or stored.
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XOP introduces another level of processing. Therefore, it introduces extra complexity and processing overheads.
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XOP does not mandate the use of the MIME packaging mechanism, so other packaging mechanisms could be used.
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206:"cid:http://example.org/me.png"
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75:XOP operates on a single XML Infoset.
19:(XOP) is a mechanism defined for the
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850:Web Content Accessibility Guidelines
289:W3C's XML-binary Optimized Packaging
39:back into the XML Information Set.
93:The XOP specification defines how
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1073:Multimodal Interaction Activity
1033:Community & business groups
275:XML-Binary Optimized Packaging
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17:XML-binary Optimized Packaging
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871:Web Accessibility Initiative
1156:(browser/editor, 1996–2012)
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105:Usage in SOAP Web services
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962:World Wide Web Foundation
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866:Markup Validation Service
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326:World Wide Web Consortium
251:// binary octets for png
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98:inside the XML Infoset.
277:(article from Dr Dobbs)
209:/></m:photo>
188:"image/png"
174:<soap:Envelope>
185:xmlmime:contentType=
25:XML Information Sets
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352:ActivityPub
242:example.org
240:<http://
238:Content-ID:
182:<m:photo
156:application
1098:CERN httpd
885:Deprecated
859:Initiative
843:Guidelines
751:XHTML+SMIL
619:Encryption
582:Webmention
545:Timed text
382:Animations
268:References
197:xmlns:xop=
1148:(1994–97)
1140:(1994–97)
1132:(1993–98)
1121:Line Mode
926:Obsoleted
736:IndieAuth
644:Signature
634:Namespace
431:IndexedDB
409:EmotionML
336:standards
71:Operation
1206:Category
1113:Browsers
1087:Software
1019:WebAuthn
716:elements
686:XPointer
654:XInclude
550:VoiceXML
456:Micropub
255:See also
137:boundary
43:Benefits
29:infosets
1184:(IW3C2)
1178:(IW3C)
1124:(1990–)
829:XFrames
441:JSON-LD
387:Flexbox
1103:Libwww
1064:(DDWG)
1024:WHATWG
892:C-HTML
814:WebGPU
706:XSL-FO
696:XQuery
649:XForms
639:Schema
624:Events
587:WebSub
540:SPARQL
476:Schema
451:MathML
246:me.png
235:binary
50:base64
33:binary
1153:Amaya
1137:Agora
1129:Arena
1075:(MMI)
983:Board
819:WebXR
789:InkML
779:CURIE
774:CCXML
741:XAdES
729:Notes
691:XProc
669:XPath
659:XLink
602:+RDFa
597:XHTML
535:SHACL
530:SCXML
424:HTML5
328:(W3C)
248:>
223:image
203:href=
60:Costs
1145:Argo
1068:HTML
907:PGML
902:JSSS
897:HDML
824:XFDL
809:sXBL
711:XSLT
614:Base
592:WOFF
577:WSDL
513:SSML
503:SRGS
498:SOAP
493:SMIL
488:SKOS
483:SISR
419:HTML
392:Grid
362:ARIA
261:MTOM
213:...
191:>
180:...
176:...
170:...
165:+xml
128:1.0
115:MTOM
111:SOAP
95:MIME
1009:SVG
1004:CSS
988:TAG
933:P3P
912:VML
799:RIF
794:MSE
784:EME
756:XUP
746:XBL
701:XSL
679:3.x
674:2.0
664:XOP
609:XML
560:WoT
518:SVG
508:SRI
471:RDF
466:PLS
461:OWL
436:ITS
404:EXI
399:DOM
377:CSS
372:CDF
229:png
162:xop
147:...
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27:(
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