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1		-expert-create-your-transformations-xpath-expert
	1	+Image Transformations

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1	1	{{container}}{{container layoutStyle="columns"}}(((
2		-Within the crash course, we already explained XPath conceptually. In that same microlearning, we looked at some more uncomplicated cases of using XPath within your transformation. If you need to brush up on that knowledge, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Platform.crashcourse-platform-create-transformation-xpath-basic.WebHome||target="blank"]]. In the intermediate microlearning on this subject, we built upon that knowledge. Please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Create your transformations.intermediate-create-your-transformations-xpath-intermediate.WebHome||target="blank"]] if you need a refresher on that. In the [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Advanced Level.Create your transformations.advanced-create-your-transformations-xpath-advanced.WebHome||target="blank"]] that followed, we built upon that knowledge and looked at some concrete, practical examples that could be useful in your project. In this microlearning, we will wrap the concept of XPath by looking at three complex XPath alternatives that are sometimes needed when dealing with messages in eMagiz.
	2	+In most cases, you will transform XML messages to other XML messages, or you will transform JSON or EDI messages in another of these formats. However, sometimes you want to perform an image transformation. With this image transformation you can transform images in certain formats to another format (i.e. png). This can come in handy when you want to standardize the image format before using it further downstream in your business application(s).
3	3
4	4	Should you have any questions, please get in touch with [[academy@emagiz.com>>mailto:academy@emagiz.com]].
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6	6	== 1. Prerequisites ==
7	7
8	8	* Expert knowledge of the eMagiz platform
9		-* [[XPath Basic>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Platform.crashcourse-platform-create-transformation-xpath-basic.WebHome||target="blank"]]
10		-* [[XPath Intermediate>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Create your transformations.intermediate-create-your-transformations-xpath-intermediate.WebHome||target="blank"]]
11		-* [[XPath Advanced>>doc:Main.eMagiz Academy.Microlearnings.Advanced Level.Create your transformations.advanced-create-your-transformations-xpath-advanced.WebHome||target="blank"]]
12	12
13		-
14	14	== 2. Key concepts ==
15	15
16		-This microlearning focuses on very complex XPath operations.
	12	+This microlearning focuses on performing image transformations in eMagiz.
17	17
18		-With XPath Expert, we mean learning that XPath options are sometimes very complex but could benefit you in specific cases in your daily work.
	14	+With image transformation, we mean transforming the raw data that represents an image to another image format.
19	19
20		-Some of the very complex XPath options are:
	16	+* Read the helptext of the component to understand which formats are supported
	17	+* Ensure the input image is supplied in the correct format
	18	+* Ensure you wrap the output image in something if you want to do additional transformations on the data further downstream
21	21
22		-* matches
23		-* replace
24		-* tokenize
	20	+== 3. Image Transformation ==
25	25
26		-== 3. XPath Expert ==
	22	+In most cases, you will transform XML messages to other XML messages, or you will transform JSON or EDI messages in another of these formats. However, sometimes you want to perform an image transformation. With this image transformation you can transform images in certain formats to another format (i.e. png). This can come in handy when you want to standardize the image format before using it further downstream in your business application(s).
27	27
28		-Within the crash course, we already explained XPath conceptually. In that same microlearning, we looked at some more uncomplicated cases of using XPath within your transformation. If you need to brush up on that knowledge, please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Crash Course.Crash Course Platform.crashcourse-platform-create-transformation-xpath-basic.WebHome||target="blank"]]. In the intermediate microlearning on this subject, we built upon that knowledge. Please check out this [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Intermediate Level.Create your transformations.intermediate-create-your-transformations-xpath-intermediate.WebHome||target="blank"]] if you need a refresher on that. In the [[microlearning>>doc:Main.eMagiz Academy.Microlearnings.Advanced Level.Create your transformations.advanced-create-your-transformations-xpath-advanced.WebHome||target="blank"]] that followed, we built upon that knowledge and looked at some concrete, practical examples that could be useful in your project. In this microlearning, we will wrap the concept of XPath by looking at three complex XPath alternatives that are sometimes needed when dealing with messages in eMagiz.
	24	+Before we dive into the specifics of how to configure this let us first consider the following:
29	29
30		-Some of the very complex XPath options are:
	26	+* Read the helptext of the component to understand which formats are supported
	27	+* Ensure the input image is supplied in the correct format
	28	+* Ensure you wrap the output image in something if you want to do additional transformations on the data further downstream
31	31
32		-* matches
33		-* replace
34		-* tokenize
	30	+{{warning}}The focus of this microlearning lies on the image transformer component. Ensuring that the input is useful and the output fits the remainder of the process is highly depending on the use case and will therefore not be discussed in this microlearning{{/warning}}
35	35
36		-=== 3.1 matches ===
	32	+When turning to the Create phase of eMagiz, we need to open the flow and enter "Start Editing" mode to add the component we need. For example, in the left panel, you can search for "Image". This will yield the following result.
37	37
38		-Sometimes, you want to determine whether a specific value within your payload matches a pattern. In those cases, you can use the XPath function called matches. The function will return true if the supplied string matches a given regular expression. So, for example, if you want to check whether your OrderID contains exactly seven digits and nothing else, the following XPath expression will work for your use case.
	34	+[[image:Main.Images.Microlearning.WebHome@expert-create-your-transformations-image-transformation-image-transformation-component.png]]
39	39
40		-matches(OrderID,'^\d{7}$')
41		-
42		-As a result, you will get a true or false back which you can then use as a filter or within an if-then-else construction.
43		-
44		-=== 3.2 replace ===
45		-
46		-The replace function has many similarities with the matches function. It builds on the premise of the matches function, but instead of returning a true or false, you can state with what you want to replace the matched string. In other words, this function returns a string produced from the input string by replacing any substrings that match a given regular expression with a supplied replacement string.
47		-
48		-When we apply this to our earlier example, we can state that when the OrderID contains any non-digit, we will replace this value with nothing. This will lead to the following XPath expression.
49		-
50		-replace(OrderID,'\D','')
51		-
52		-With a given input string of 12C34A567, the returned result will be 1234567.
53		-
54		-=== 3.3 tokenize ===
55		-
56		-The tokenize function can split a string into multiple entries for you. This is particularly useful when you want to match an input string to a list of possible values that are valid for that string. For example, the function returns a sequence of strings constructed by splitting the input wherever a separator is found; the separator is any substring that matches a given regular expression.
57		-
58		-So, for example, when the input string for AddressID is "street,housenumber,housenumberaddition" and you want to tokenize this with the help of the separator, you could use, in this example, the comma between the values as the separator. This will lead to the following XPath expression.
59		-
60		-tokenize(AddressID,',')
61		-
62		-The given input detailed above will result in the following output: street housenumber housenumberaddition.
63		-
64	64	== 4. Assignment ==
65	65
66	66	Check out which of the XPaths we have discussed today can be found within your project.